Can Jack Dempsey Fish Develop Friendships?

Jack Dempsey fish are known for their bright colors and energetic movements, making them a popular choice for home aquariums. Many people enjoy observing their behavior and interactions with other fish in the tank.

Jack Dempsey fish can form basic social connections, especially when introduced carefully to compatible tank mates. They display recognition and familiarity but tend to be territorial, limiting the depth of friendships compared to more social species.

Learning about their social behaviors can help you create a calmer and more balanced aquarium environment. Observing these interactions adds a new layer of enjoyment to fishkeeping.

Understanding Jack Dempsey Fish Behavior

Jack Dempsey fish are naturally territorial, which can make them seem aggressive at first. They often stake out a favorite corner or hiding spot and will defend it from other fish. Despite this, they are intelligent and can recognize other tank inhabitants over time. Observing their movements closely, you may notice patterns in how they interact, sometimes chasing new arrivals, other times swimming alongside them calmly. Their moods can change depending on tank conditions, like water temperature or space availability. A well-maintained aquarium with plenty of hiding spots helps reduce stress and aggressive tendencies. They also respond to regular feeding routines, often swimming closer when familiar hands approach the tank. These behaviors show that while they are not overtly social, Jack Dempseys can adapt to their environment and develop a level of comfort with certain fish, demonstrating subtle bonds. Monitoring their interactions is key to maintaining harmony.

When Jack Dempseys are introduced slowly and carefully, aggression decreases significantly. They can coexist peacefully with other moderately sized fish.

Providing a structured environment with rocks, plants, and visual barriers allows Jack Dempsey fish to establish territories without constant conflict. Over time, they may tolerate each other in overlapping areas of the tank. Watching these behaviors helps owners understand the fish’s personality and limits. This creates a more relaxed atmosphere and makes the aquarium more enjoyable to observe.

Signs of Recognition in the Aquarium

Jack Dempsey fish can remember other fish in their tank and adjust behavior accordingly.

They often show recognition by swimming near familiar fish without chasing them. Occasionally, they may even mirror movements or display gentle curiosity. This recognition develops over weeks of consistent tank conditions and careful introductions. Providing hiding spaces and avoiding sudden changes helps reduce stress, encouraging natural interactions. Observation is important to see subtle cues, like circling or parallel swimming, which indicate comfort. Understanding these signs allows you to manage your aquarium better and maintain peaceful coexistence. Over time, you may notice certain fish that consistently stay closer to each other while others keep their distance. These patterns highlight that Jack Dempseys can differentiate between individual tank mates, showing selective tolerance. Adjusting tank layout or adding visual barriers can further improve harmony. Watching these behaviors provides insight into their natural instincts, and helps create an environment where aggression is minimized, and fish can thrive safely together.

Tank Setup for Peaceful Interactions

Providing enough space is crucial for Jack Dempsey fish. Crowded tanks increase stress and aggression, while ample room allows them to explore and establish territories without constant conflict.

Adding rocks, plants, and hiding spots creates boundaries that help reduce fights. Using driftwood or caves encourages natural behavior, giving each fish a private area. Open swimming areas combined with structured spaces allow them to choose how close to interact with other tank mates. Water quality also plays a role; clean, well-filtered water supports calmer behavior and better overall health. Over time, these adjustments lead to more predictable social patterns and fewer territorial disputes, making the tank more enjoyable to observe. Monitoring how fish respond to these additions allows for gradual improvements, helping the environment suit their natural instincts.

Introducing visual barriers in the tank can further minimize stress. Jack Dempseys use them to hide or rest, reducing direct confrontations.

Consistent feeding routines strengthen positive behaviors and help fish associate the tank with safety. Predictable schedules reduce sudden movements and sudden competition for food, which can trigger aggression. Observing how fish respond during feeding times can reveal compatible pairings or indicate which individuals need more space. Adjusting decorations or rearranging hiding spots occasionally prevents boredom and reduces repeated conflicts. Over weeks, these small changes create a calmer tank dynamic. The fish begin recognizing their territory and other inhabitants, improving cohabitation. Attention to water parameters, including temperature and pH, also supports steady behavior. Providing a balanced diet ensures health and reduces irritability. With patience, owners can foster a more stable and harmonious aquarium environment that respects the Jack Dempsey’s natural instincts and promotes peaceful coexistence.

Feeding and Social Responses

Jack Dempsey fish often show interest in food before interacting with other fish, revealing social patterns. Their movements at feeding times indicate hierarchy and comfort levels within the tank.

When feeding, dominant fish may approach first, while others wait or stay near hiding spots. Over time, these patterns become predictable, and fish may learn to feed alongside certain tank mates without conflict. Offering food in multiple areas reduces competition and allows shy or smaller fish to eat safely. Watching how Jack Dempseys respond to different types of food can provide insight into their personalities and interactions. Feeding behavior often reflects broader social tolerance and stress levels. Adjusting feeding techniques can influence harmony, helping less aggressive fish thrive alongside more dominant individuals. Careful observation and thoughtful feeding placement are key to maintaining a balanced environment where fish feel secure and interactions remain peaceful.

Observing Interactions

Jack Dempsey fish often display subtle signs when interacting with other tank mates. They may swim parallel, hover near each other, or occasionally chase one another lightly, showing recognition without serious aggression.

Body language is key. Flaring fins, rapid darting, or chasing can indicate tension, while calm swimming together signals tolerance. Observing these cues helps manage tank harmony.

Adjusting Tank Dynamics

Rearranging plants, rocks, or hiding spaces can reduce conflicts. Changing the layout allows fish to reestablish territories naturally, lowering stress and promoting calmer interactions over time.

Compatible Tank Mates

Jack Dempsey fish do better with similarly sized, non-aggressive fish. Avoid small, slow-moving species that may trigger predatory behavior. Providing compatible companions reduces aggression and creates a more balanced aquarium environment.

Monitoring Stress

Watch for signs of stress, including hiding, loss of appetite, or faded colors. Early detection allows adjustments to improve the tank environment and overall fish wellbeing.

FAQ

Can Jack Dempsey fish live with other fish?
Yes, they can live with other fish if the tank is large enough and companions are chosen carefully. Avoid small, slow-moving fish that may trigger chasing. Medium-sized, robust fish that occupy different areas of the tank work best, reducing aggression and stress.

How do I introduce new fish to a Jack Dempsey tank?
Introduce new fish slowly and monitor their interactions closely. Adding visual barriers or rearranging decorations before introductions can reduce territorial disputes. Quarantining new fish for a short period also helps prevent disease and allows a gradual, controlled introduction.

Do Jack Dempsey fish recognize individual tank mates?
Yes, they show signs of recognition. Over time, they may swim closer to familiar fish or display calmer behavior around them. This recognition is not a deep bond but indicates selective tolerance and familiarity within the tank.

What signs show Jack Dempsey fish are stressed?
Stress can appear as hiding constantly, loss of appetite, faded colors, or erratic swimming. Changes in water conditions, overcrowding, or aggressive tank mates can trigger stress. Early detection allows adjustments to the tank environment to improve their wellbeing.

Can Jack Dempsey fish be trained to recognize owners?
Yes, they can learn to associate owners with feeding times. Over weeks, they may swim toward your hand or the front of the tank when approaching. This behavior reflects recognition and trust, even if limited, enhancing interaction.

What are the best hiding spots for Jack Dempsey fish?
Caves, rocks, and dense plants work well. Visual barriers reduce direct conflicts and allow fish to rest or escape aggressive encounters. Rearranging these spots occasionally prevents boredom and helps maintain balanced territories.

How do feeding routines affect social behavior?
Consistent feeding times reduce stress and aggression. Feeding in multiple areas prevents competition, allowing shy or smaller fish to eat safely. Observing feeding behavior helps identify dominant and subordinate fish, guiding tank management.

Are Jack Dempsey fish more aggressive during breeding?
Yes, they become highly territorial while breeding. Removing other fish or providing ample hiding spots can prevent harm. During this time, monitoring closely is essential to ensure the safety of all tank inhabitants.

What water conditions support calm behavior?
Clean, well-filtered water with stable temperature and pH helps reduce stress. Fluctuations in water quality can trigger aggression and health issues. Regular maintenance and testing create a predictable environment, encouraging more peaceful interactions.

Do Jack Dempsey fish need companions?
They do not require companions to thrive but can tolerate other compatible fish. Carefully selected tank mates can enrich their environment and provide mild social interaction, improving overall activity and engagement without increasing aggression.

How do I know which fish are compatible?
Look for medium-sized, semi-aggressive or peaceful species that occupy different levels of the tank. Avoid very small or slow-moving fish, as well as other highly aggressive species that may compete for territory. Observing interactions over time helps confirm compatibility.

Can tank layout influence aggression?
Yes, the arrangement of rocks, plants, and hiding spots strongly affects behavior. A well-structured tank with visual barriers reduces stress, prevents repeated territorial disputes, and allows fish to coexist more calmly. Periodic adjustments maintain balance and prevent boredom.

How long does it take for Jack Dempsey fish to adjust to new tank mates?
Adjustment can take several weeks. Initial chasing and territorial displays are normal. Over time, fish learn boundaries and tolerate each other, particularly if the tank provides sufficient space and hiding spots. Patience and observation are key.

What are common mistakes when keeping Jack Dempsey fish with others?
Common mistakes include overcrowding, adding incompatible species, failing to provide hiding spots, or introducing new fish abruptly. Ignoring water quality and feeding routines can also increase aggression and stress, harming both the Jack Dempsey and its tank mates.

Can Jack Dempsey fish form lasting bonds?
While they do not form emotional bonds like mammals, they show selective recognition and tolerance. Certain tank mates may consistently interact without conflict, indicating a stable social pattern, though this is based on familiarity rather than friendship.

How can I encourage calmer interactions in the tank?
Provide enough space, hiding spots, visual barriers, and compatible tank mates. Maintain consistent water conditions and feeding routines. Monitor behavior and make gradual adjustments to tank layout or companions if aggression persists. These steps promote a more peaceful environment.

Are Jack Dempsey fish active during the day or night?
They are primarily active during the day, exploring the tank and interacting with other fish. Nighttime is usually spent resting in hiding spots or near the tank bottom, making sufficient cover important for their sense of security.

Does tank size matter for social behavior?
Yes, larger tanks reduce aggression by giving each fish space to establish a territory. Crowded tanks increase stress and conflict. Proper space, combined with structured decorations, ensures healthier interactions and more stable social patterns.

What should I do if aggression becomes extreme?
Separating overly aggressive fish or adding more hiding spots can help. Sometimes, reintroducing fish gradually or adjusting tank mates is necessary. Observing behavior carefully allows you to respond before stress or injury occurs.

How does diet affect temperament?
A balanced, high-quality diet supports health and reduces irritability. Hungry or undernourished fish are more likely to show aggression. Feeding multiple times a day in measured portions helps maintain calm behavior and predictable interactions.

Is it normal for Jack Dempsey fish to chase each other occasionally?
Yes, occasional chasing is normal territorial behavior, especially in new or rearranged tanks. As long as it does not escalate to injury, this behavior is part of establishing boundaries and does not indicate incompatibility.

How can I track social changes over time?
Keeping notes or video recordings of interactions helps track which fish tolerate each other, which are dominant, and how behavior evolves. Adjustments to tank layout or companions can then be made based on real observation rather than guesswork.

Do Jack Dempsey fish interact differently with males and females?
During breeding, males become more territorial, while females may retreat or become cautious. Outside breeding periods, sex differences are less pronounced, but subtle dominance patterns may still influence interactions. Observing these dynamics ensures peaceful coexistence.

Can environmental enrichment reduce stress?
Yes, adding varied decorations, hiding spots, and plants prevents boredom and reduces repeated conflicts. Environmental enrichment encourages natural exploration and helps Jack Dempseys feel secure while interacting with others.

How often should tank mates be changed?
Frequent changes can increase stress and aggression. Once a compatible setup is established, minimal adjustments are best. Only add or remove fish carefully, monitoring behavior to maintain tank harmony.

What is the best way to observe social behavior?
Watch from a distance without disturbing the tank. Note body language, swimming patterns, and feeding behavior. Observing consistently at similar times each day provides the clearest understanding of social dynamics.

How do Jack Dempsey fish handle overcrowding?
Overcrowding increases aggression, stress, and potential health issues. It can lead to constant chasing and hiding. Ensuring adequate space, hiding spots, and compatible fish is essential to prevent these problems.

Can I keep only Jack Dempsey fish together?
Yes, a tank with only Jack Dempseys can work if there is enough space and visual barriers. Multiple individuals may still establish territories, but aggression is easier to manage when no other species are present.

How long do these fish live in a well-maintained tank?
With proper care, Jack Dempsey fish can live 8–10 years. Maintaining water quality, diet, and a balanced social environment supports long-term health and predictable behavior.

Do they show recognition of their environment?
Yes, they become familiar with hiding spots, feeding locations, and tank layout. Changes in their environment can temporarily increase stress or aggression, so gradual adjustments are recommended.

Can observing social behavior improve overall care?
Yes, tracking interactions allows for timely adjustments in tank layout, companions, and feeding routines. This reduces stress, prevents injuries, and ensures a healthier, more balanced environment for the fish.

Is it safe to add new fish if the tank is already stable?
It can be, but introductions should be slow and carefully monitored. Sudden additions can trigger aggression, so preparing the tank with hiding spots and visual barriers is essential for a smooth transition.

Do Jack Dempsey fish respond differently to various food types?
Yes, they may show stronger interest in protein-rich foods like live or frozen items. Observing preferences helps manage feeding routines and ensures all fish are fed without triggering unnecessary competition.

Can their behavior indicate health problems?
Abnormal aggression, lethargy, or loss of appetite may signal health issues. Regular observation helps detect problems early, allowing adjustments in water quality, diet, or medical care as needed.

Are they suitable for beginner fishkeepers?
Jack Dempseys require careful tank management, compatible companions, and attention to water quality. Beginners can succeed with research, proper setup, and observation, though they may be challenging compared to less territorial fish.

How can I make interactions safer for smaller tank mates?
Provide multiple hiding spots, visual barriers, and feeding in separate areas. Observing for bullying and intervening when needed ensures smaller fish are protected while allowing Jack Dempseys to display natural behavior.

Do they remember aggressive encounters?
Yes, they may avoid fish that previously challenged them or assert dominance over weaker individuals. This memory influences future interactions and contributes to social hierarchy within the tank.

How do seasonal changes affect behavior?
Water temperature and daylight changes can slightly alter activity levels. Maintaining stable conditions minimizes stress and keeps social behavior predictable, reducing conflicts during seasonal shifts.

Can tank decorations influence breeding behavior?
Yes, caves and dense plants encourage breeding and territorial displays. Providing these features allows Jack Dempseys to establish nesting areas while minimizing aggression toward other fish.

Are aggressive displays always dangerous?
No, occasional chasing or flaring is part of establishing territory. Only repeated or injurious attacks require intervention. Proper tank management helps prevent escalation and maintains a balanced environment.

How do I know if two Jack Dempseys will tolerate each other?
Introduce them gradually with plenty of space and hiding spots. Observing behavior for several weeks shows whether tolerance develops or if separation is needed to prevent stress or injury.

Can observing feeding patterns improve social harmony?
Yes, it reveals dominant and subordinate fish, helps adjust food placement, and reduces competition. Balanced feeding supports calmer interactions and a healthier tank dynamic.

Do they interact differently in planted versus bare tanks?
Planted tanks offer hiding spots and visual barriers, reducing aggression and providing enrichment. Bare tanks often increase territorial disputes due to lack of cover, making behavior more intense and stressful.

Can subtle aggression affect long-term health?
Yes, repeated stress from mild chasing or dominance displays can weaken immune systems. Ensuring space, hiding spots, and compatible companions prevents chronic stress and promotes longevity.

How do Jack Dempsey fish communicate?
Through body language, fin displays, and chasing. Flaring fins, circling, and parallel swimming indicate dominance, tolerance, or curiosity. Understanding these cues allows better tank management.

What is the best way to reduce bullying?
Provide multiple hiding spots, rearrange decorations periodically, and avoid overcrowding. Careful selection of tank mates and observing interactions ensures bullying is minimized while natural behavior is expressed.

Can stress influence color?
Yes, stressed Jack Dempseys often lose vibrant coloration. Stable water, sufficient space, and reduced aggression help maintain bright colors and healthy appearance.

Do they ever show playful behavior?
Occasionally, they chase each other lightly or swim together without aggression. This behavior indicates comfort in the tank and familiarity with companions.

How do I maintain a stable social hierarchy?
Gradual introductions, sufficient space, hiding spots, and consistent feeding routines establish predictable boundaries. Observing interactions allows adjustments to keep hierarchy stable without injury or excessive stress.

Can observing behavior prevent future problems?
Yes, monitoring interactions, feeding, and activity levels allows early detection of aggression, stress, or health issues. This proactive approach ensures a balanced, peaceful tank environment for all fish.

Is it necessary to separate aggressive individuals permanently?
Not always. Temporary separation during conflict resolution or breeding periods may suffice. Long-term separation is only needed if aggression causes injury or chronic stress.

How important is water temperature for social behavior?
Stable temperatures prevent sudden increases in aggression or lethargy. Jack Dempseys are sensitive to fluctuations, so maintaining consistent water parameters supports predictable interactions and overall health.

Can visual observation alone determine compatibility?
Observation provides strong insight into tolerance, aggression, and feeding behavior. Combined with knowledge of species behavior, it allows informed decisions about tank mates and layout for long-term harmony.

Do Jack Dempsey fish interact differently with humans versus fish?
Yes, interactions with humans are usually based on feeding recognition and curiosity. Social behaviors with other fish involve territory, recognition, and tolerance, which differ from human-directed responses.

How can I encourage positive interactions?
Provide space, hiding spots, visual barriers, compatible companions, stable water, and consistent feeding. Observation and adjustments help maintain calm behavior while allowing natural territorial and social patterns.

Are interactions more predictable in mature tanks?
Yes, once fish have established territories and social patterns, behavior becomes more predictable. Stable setups with consistent conditions support long-term peace and reduce unexpected aggression.

Can rearranging the tank upset social balance?
Yes, changes can trigger chasing or stress as fish reestablish territories. Gradual adjustments and added hiding spots help minimize disruption and maintain harmony.

How long should I observe new interactions before making changes?
Several weeks is ideal. This allows fish to establish boundaries and comfort levels. Observing consistently helps determine if changes are necessary or if tolerance develops naturally.

Do Jack Dempsey fish form consistent patterns of interaction?
Yes, over time, certain fish tolerate each other, while others keep distance. Recognizing these patterns helps maintain a balanced tank and reduces unnecessary conflicts.

How do I know when aggression is normal?
Light chasing, fin flaring, or circling is normal for establishing territory. Aggression becomes concerning when it causes injury, persistent stress, or prevents fish from accessing food or hiding spots.

Are they better kept in groups or alone?
They can be kept alone or with compatible tank mates. Groups require careful management, space, and observation to prevent territorial disputes, while single individuals eliminate social stress entirely.

Can environmental changes improve social tolerance?
Yes, adding plants, hiding spots, or visual barriers can reduce aggression. Gradual environmental adjustments encourage calmer interactions and allow fish to coexist safely.

Do Jack Dempsey fish ever ignore each other?
Yes, they may swim independently for periods, showing tolerance and comfort. Ignoring each other indicates minimal conflict and a stable social environment.

Can observing behavior improve breeding success?
Yes, monitoring interactions helps identify compatible pairs, understand territory needs, and reduce stress. A calm, well-structured environment supports successful breeding while protecting other tank mates.

How do I balance territory and swimming space?
Provide enough open areas for swimming and structured hiding spots for privacy. This allows fish to explore freely while respecting each other’s space, reducing aggression and stress.

Do Jack Dempsey fish interact differently in planted vs. rocky tanks?
Planted tanks encourage hiding and calm coexistence. Rocky tanks provide clear territory markers, which may increase initial chasing but help establish defined boundaries for long-term peace.

Can observing interactions prevent illness?
Yes, stress from aggression can weaken immunity. Watching behavior allows early detection of stress or disease, enabling intervention before health deteriorates.

Is patience important when managing social behavior?
Absolutely. Jack Dempseys take time to establish tolerance and recognition. Gradual introductions, careful observation, and adjustments prevent unnecessary aggression and support a balanced tank environment.

Do tank lighting and schedule affect social interactions?
Consistent lighting supports predictable activity levels and feeding behavior. Sudden changes can increase stress and aggression, so maintaining a regular schedule is beneficial.

How often should I monitor interactions?
Daily observation is ideal, especially after changes in tank setup, feeding routines, or introductions. Consistent monitoring helps detect early signs of aggression, stress, or health issues.

Can Jack Dempsey fish interact safely with other cichlids?
Yes, if the species are similar in size and temperament. Avoid highly aggressive or overly passive cichlids. Gradual introductions and careful observation are essential to maintain harmony.

Do they show preference for certain tank mates?
Yes, over time, they may tolerate some fish more than others, consistently swimming nearby or interacting calmly while avoiding others that trigger chasing or stress.

Can social behavior indicate overall happiness?
Observing calm interactions, regular activity, and normal feeding behavior reflects reduced stress and a comfortable environment. Disruptions or constant aggression indicate issues that need attention.

Is it normal for them to compete for space?
Yes, competition is natural, especially when new fish are introduced. Providing adequate hiding spots, visual barriers, and space minimizes harmful conflicts while allowing natural territorial behavior.

Can rearranging hiding spots reduce repeated aggression?
Yes, it disrupts established territories temporarily, allowing fish to reestablish boundaries and reducing repeated targeting of specific individuals, helping maintain balance in the tank.

Do they interact differently during feeding vs. resting?
Yes, feeding triggers temporary hierarchy and chasing behavior, while resting periods show tolerance and minimal interaction. Recognizing these patterns helps manage tank dynamics effectively.

How important is observation for long-term tank success?
Observation is critical. Understanding individual personalities, social patterns, and reactions to environment allows proactive adjustments, preventing aggression, stress, and health problems for all tank inhabitants.

Can I track compatibility visually or with notes?
Yes, recording interactions, chasing, feeding order, and hiding patterns over time provides valuable insight. This helps guide tank management, layout adjustments, and decisions about companions for long-term harmony.

Do Jack Dempsey fish need daily interaction to stay calm?
No, they primarily respond to feeding and environmental conditions. Calm, predictable surroundings with sufficient space and hiding spots are more important for stable social behavior than daily human interaction.

Can interactions change as fish age?
Yes, younger fish may be more aggressive or exploratory, while mature fish establish stable territories and tolerate companions more consistently. Adjusting tank setup to age-related behavior helps maintain harmony.

Are aggressive behaviors more frequent in small tanks?
Yes, limited space increases competition for territory and hiding spots, raising stress and aggression. Adequate tank size with structured areas reduces conflicts and supports calmer interactions.

Can Jack Dempseys coexist with fast-moving schooling fish?
Yes, fast, agile schooling fish that occupy different areas of the tank are generally safe companions. They are less likely to trigger chasing and can coexist without conflict.

How do I know when to separate a fish permanently?
Permanent

Final Thoughts

Jack Dempsey fish are interesting and colorful additions to an aquarium, but they require careful management to thrive. Their natural territorial behavior can make them seem aggressive, yet with the right setup, they can live peacefully alongside compatible tank mates. Providing enough space is essential, as overcrowding increases stress and conflict. Rocks, plants, and hiding spots help create boundaries that reduce chasing and allow each fish to establish a territory without constant confrontation. Observing their behavior closely is important, as it gives insight into how they interact with each other and what adjustments may be needed. Simple changes, like adding a cave or rearranging decorations, can make a big difference in maintaining a calm environment.

Feeding routines and water conditions also play a significant role in how Jack Dempsey fish behave. Consistent feeding schedules help reduce competition and aggression, and offering food in multiple areas ensures that all fish, even shy ones, get a fair share. Clean, well-maintained water keeps them healthy and lowers stress, which naturally leads to more stable social behavior. They can show recognition of other fish in the tank and may tolerate certain companions better than others, although their interactions are based more on familiarity and territory than true social bonds. Even small signs, like swimming together without chasing or circling each other calmly, indicate a level of comfort. Watching these behaviors over time allows an owner to adjust the tank setup, choose suitable companions, and prevent problems before they escalate.

While Jack Dempsey fish do not form deep emotional connections, they can coexist in a balanced and peaceful aquarium with careful planning and observation. Patience is key, as it can take weeks for fish to settle and establish consistent social patterns. Providing space, hiding spots, visual barriers, and compatible tank mates helps reduce stress and allows natural behaviors to be expressed safely. Regular monitoring, maintaining water quality, and observing feeding and interaction patterns are important for long-term success. With proper care, Jack Dempsey fish can live healthy, active lives and offer enjoyment to their owners while interacting predictably with other fish. Understanding their behavior, creating a structured environment, and paying attention to their needs ensures a calm and harmonious aquarium where both the fish and the owner can feel confident in their shared space.