7 Things to Never Do Around Gourami

Do you ever find yourself unsure about how to act around your gourami, especially when they seem stressed or withdrawn? These fish may be small, but they have specific needs that should not be ignored.

Certain behaviors can cause stress, illness, or even aggression in gourami. Avoid tapping on the glass, sudden water changes, overcrowding, or placing them with incompatible tank mates, as these factors can significantly impact their well-being and behavior.

Knowing what to avoid helps create a safer, calmer space for your gourami. The following list will guide you through key actions to never take around them.

Never Tap on the Glass

Tapping on the glass might seem harmless, but it causes a sudden noise and vibration that gourami can’t process well. Their sensitivity to movement and sound means that each tap feels disruptive. These small fish respond to their environment using their lateral line system, which detects vibrations. Frequent tapping can trigger stress responses that weaken their immune system and affect their appetite. If they are constantly startled, gourami might begin to hide, act aggressively, or even show signs of illness. Maintaining a calm and stable environment encourages their natural behaviors and allows them to stay relaxed and active in the tank.

A calm environment is essential for their comfort. Instead of tapping, observe quietly from a distance and allow your gourami to come forward naturally.

Creating a stress-free habitat gives your gourami the space to act more like themselves. You’ll see more active swimming, brighter coloring, and less hiding over time.

Don’t Keep Them with Aggressive Fish

Gourami do not do well with aggressive tank mates. These fish prefer calm, peaceful environments and will suffer in tanks with fin-nippers or territorial species.

Aggressive tank mates can lead to injured fins, constant stress, and unpredictable behavior. Even semi-aggressive fish like certain barbs or cichlids may cause problems. Gourami are generally peaceful, but they may become defensive or withdrawn if regularly harassed. This disrupts their eating and resting habits. Long-term exposure to bullying can result in reduced immunity, making them more vulnerable to infections or disease. Compatibility is important when setting up a tank with multiple species. Choose calm companions such as small tetras, rasboras, or bottom dwellers like cory catfish. These allow your gourami to thrive in a low-conflict setting. If signs of stress or fin damage appear, it may be time to rehome certain fish. Always monitor interactions, especially in community tanks, and adjust tank mates if needed.

Avoid Sudden Water Changes

Rapid changes in water conditions can shock gourami, causing them to hide, breathe heavily, or become inactive. Sudden shifts in temperature, pH, or hardness affect their ability to adjust and often lead to long-term stress.

Instead of changing large amounts of water at once, perform small, consistent water changes—around 20 to 25 percent weekly. This helps maintain stability without overwhelming their system. Always treat tap water with a dechlorinator and ensure the new water matches the tank’s temperature and pH. Sudden fluctuations can weaken their immune system and leave them open to diseases like ich or fin rot. Regular water tests help you track any changes in parameters. Use a thermometer and test kit before adding fresh water. Stable water conditions support healthy breathing, consistent energy levels, and smoother swimming patterns in gourami. Keeping their environment steady is one of the most important ways to protect their health and behavior.

When water parameters shift too quickly, gourami can become disoriented or agitated. Their breathing may become erratic, and their color can dull. These changes are signs that something is wrong. Reducing this risk with gradual, well-planned maintenance keeps them comfortable and more likely to show natural, relaxed behavior in the tank.

Don’t Overcrowd the Tank

Overcrowding makes it harder for gourami to find quiet spaces, leading to increased aggression or stress. Limited swimming room and reduced oxygen levels only add to the pressure, especially in smaller tanks without good filtration.

Gourami need both space and territory to feel secure. When the tank is too full, they compete for hiding spots and territory, which can result in chasing, fin nipping, and defensive behavior. A crowded tank also means more waste, faster ammonia buildup, and lower water quality. All of these factors contribute to poor health and unpredictable behavior. To prevent this, always consider the adult size of each fish and provide at least 20 gallons for one gourami, with more space for additional tank mates. Include plants and decorations to create separate zones and resting places. Spacing things out helps reduce visual stress, making it easier for gourami to settle and thrive in their surroundings.

Don’t Use Strong Water Currents

Gourami prefer calm waters. Strong filters or powerheads can make them struggle to swim, especially near the top where they breathe. Heavy flow stresses them out and forces them to hide or stay in one corner of the tank.

Always choose a filter with adjustable flow. If the current is too strong, try using sponge filters or baffles to slow it down. Gentle movement helps gourami swim freely and access the surface without difficulty. Calm water encourages them to explore and rest more comfortably.

Don’t Ignore Signs of Illness

Gourami may not show sickness right away, but small changes in behavior or appearance should be taken seriously. Look out for clamped fins, labored breathing, dull colors, white spots, or skipping meals. These signs could mean parasites, infections, or poor water quality. Acting quickly makes treatment easier and recovery more likely. Use a quarantine tank when needed and avoid adding medications without understanding the cause. Keep their environment clean, feed a varied diet, and reduce stress. Noticing changes early—and responding—can make a real difference in their health and long-term survival.

Don’t Tap During Feeding

Noise and vibrations during feeding can cause panic. Tapping while they eat may make them associate food with stress. They might ignore the food or become more skittish over time.

FAQ

Can gourami live with other fish?
Yes, but tank mates should be peaceful and not fin-nippers. Gourami can become territorial, especially males, so avoid pairing them with aggressive species or fast swimmers that compete for space. Good options include tetras, rasboras, or bottom dwellers like corydoras. Avoid other labyrinth fish like bettas that may provoke territorial behavior. Make sure the tank is large enough and includes plants and hiding spots to reduce stress and separate areas of activity. Keep an eye on interactions early on and remove any fish that cause visible stress or conflict.

Why is my gourami hiding all the time?
Constant hiding can be a sign of stress, poor water quality, bullying, or illness. It’s important to check the water parameters first. Make sure the tank is not overcrowded, and there are enough decorations or plants to give your gourami private spaces. Some hiding is normal, especially after a recent change like a new tank or added fish. But if it continues for days and is paired with clamped fins or loss of appetite, you should look closer at possible health issues or aggression from other tank mates.

What is the best food for gourami?
Gourami do best on a varied diet. Offer high-quality flakes or pellets made for tropical fish, but also add live or frozen food like bloodworms, brine shrimp, or daphnia. Supplement with vegetables like blanched spinach or zucchini. Feeding a mix keeps them active and boosts their immune system. Avoid overfeeding—only give what they can eat in 2 minutes. Uneaten food affects water quality. A rotating diet encourages natural foraging behavior and reduces boredom, especially in smaller tanks.

Can gourami live alone?
Yes, many gourami species, especially dwarf gourami or three-spot gourami, can live alone without issues. While some enjoy company, they don’t require it to stay healthy. In fact, keeping a single gourami can reduce aggression and stress, especially in smaller tanks. If you do keep more than one, monitor them closely and ensure they have enough space. Avoid keeping multiple males of the same species unless the tank is large enough and filled with visual barriers like plants and decorations.

How often should I clean the tank?
Clean the tank weekly by changing 20–25% of the water and wiping down algae from the glass. Vacuum the substrate to remove waste. Rinse filter media gently in old tank water, not tap water, to protect beneficial bacteria. Don’t over-clean, as that can unbalance the tank’s cycle. A steady routine helps maintain water quality and reduces the chances of illness. Watch the fish after each cleaning for signs of stress or discomfort. Stable conditions are more important than sparkling glass.

Why is my gourami not eating?
A loss of appetite can come from poor water conditions, stress, or illness. Check the water parameters, look for signs of disease, and remove any aggressive tank mates. Offer favorite foods like bloodworms or brine shrimp to tempt them. Avoid feeding too much or too often—this can also cause them to stop eating. If uneaten food builds up, clean it out to prevent spikes in ammonia. A consistent feeding schedule and clean tank will usually get them eating again within a few days.

Do gourami need a heater?
Yes, most gourami are tropical fish and prefer stable water temperatures between 75°F and 80°F. A heater helps maintain consistent warmth, especially during colder months. Sudden drops in temperature can cause stress or weaken their immune system. Use a thermometer to monitor the tank and adjust the heater as needed. Consistency is key. If the room temperature fluctuates often, a reliable heater becomes even more important. Gourami from warmer regions will be more active and healthier when kept in their preferred range.

Is it okay to use artificial plants?
Yes, artificial plants are fine as long as they’re smooth and made for aquarium use. Sharp edges can tear fins, especially on delicate species like gourami. Silk plants are a safer choice than hard plastic. Mix them with real plants if possible, or use them to create hiding spots and break up lines of sight in the tank. While live plants help with oxygen and filtration, artificial plants are easier to maintain and still provide the structure and privacy gourami like.

Final Thoughts

Gourami are beautiful and peaceful fish that can make a great addition to a freshwater tank. However, they need the right care and attention to stay healthy and happy. Understanding their behavior, diet, and environment helps prevent problems before they start. Small mistakes, like choosing the wrong tank mates or not keeping the water clean, can lead to stress and illness. By paying attention to their needs and avoiding common mistakes, you can create a peaceful and safe space for your gourami to thrive.

They do best in a stable tank with calm surroundings. Sudden changes in temperature, lighting, or tank setup can cause them to hide or act strangely. Feeding them a balanced diet and keeping up with regular tank maintenance supports their long-term health. If something seems off, such as unusual swimming or lack of appetite, take a moment to check water conditions and look for signs of stress. Most issues can be fixed quickly with a little care and observation. Always research before introducing anything new to their space.

Taking care of gourami does not have to be difficult, but it does require consistency. Staying on top of water changes, offering the right food, and choosing suitable tank mates make a big difference. With a little effort and patience, you can enjoy watching your gourami grow and live peacefully in a well-kept aquarium. Paying attention to these details helps you avoid stress for both the fish and yourself. Creating a calm, clean, and stable environment is the best way to support their natural behavior and overall health.