Glass catfish are special fish. They have bodies that are almost see-through. This makes them very interesting to watch. Many people like to keep them in their home aquariums. But glass catfish need good care to stay healthy. This guide will help you learn how to care for glass catfish easily.
What Are Glass Catfish?
Glass catfish, also called ghost catfish, have clear bodies. You can see their bones and organs inside. They come from rivers in Southeast Asia. These fish are peaceful and like to swim in groups. They are small, usually about 4 to 5 inches long. Because of their clear bodies, they look very unique in any tank.
Why Keep Glass Catfish in Groups?
Glass catfish are social fish. They need friends to feel safe. You should keep at least six glass catfish together. If you keep fewer, the fish may feel scared or shy. When in a group, they show natural behaviors. They swim together in a school and seem more active.
Why a group is necessary:
- Glass catfish feel comfortable in schools.
- They become confident and less stressed.
- They show more natural and fun behaviors.
Benefits of a larger group:
- They come out more from hiding spots.
- The fish swim closely together, looking beautiful.
- They are less shy and more active.

Credit: www.aquariumsource.com
Tank Size and Setup for Glass Catfish
Glass catfish need enough space to swim well. A tank of at least 20 gallons is best for six or more fish. Bigger tanks are even better. They like calm water with gentle flow. Strong currents can stress them out.
The tank should have some plants, rocks, and hiding places. Plants help the fish feel safe. They also like dark or shaded spots. Bright light can make them hide more.
Important Tank Details
| Tank Feature | Recommended Details |
|---|---|
| Tank Size | 20 gallons or larger for a group |
| Water Temperature | 75°F to 80°F (24°C to 27°C) |
| pH Level | 6.5 to 7.5 (slightly acidic to neutral) |
| Water Hardness | Soft to medium (2 to 12 dGH) |
| Lighting | Low to moderate light |
| Filter | Gentle flow, good filtration |
| Plants | Live or fake plants for hiding |
Feeding Glass Catfish
Glass catfish eat many types of food. In the wild, they eat small insects and tiny animals in the water. In your tank, you should feed them a varied diet. This keeps them healthy and happy.
Types Of Food To Feed Glass Catfish
- Commercial foods: High-quality flakes or pellets made for small fish.
- Live or frozen foods: Bloodworms, brine shrimp, daphnia, grindal worms, mosquito larvae.
- Slow sinking foods: Foods that sink slowly are best.
Glass catfish usually eat in the middle of the tank. They do not like to eat from the bottom. Use slow sinking pellets or flakes that float in the water. This helps them eat easily.
Feeding Tips
- Offer different foods to give all nutrients.
- Feed small amounts two times a day.
- If other fish eat first, target feed glass catfish with a dropper.
- Remove uneaten food to keep water clean.
Water and Tank Maintenance
Clean water is very important for glass catfish. They are sensitive to dirty water. You need to keep the tank clean and stable.
How To Keep Water Clean
- Do regular water changes. Change 20% of water weekly.
- Use a good filter with gentle water flow.
- Test water weekly for pH, ammonia, nitrite, and nitrate.
- Keep water temperature steady between 75°F and 80°F.
Water Parameters To Watch
| Parameter | Ideal Range |
|---|---|
| Temperature | 75°F to 80°F (24°C to 27°C) |
| pH | 6.5 to 7.5 |
| Ammonia | 0 ppm (parts per million) |
| Nitrite | 0 ppm |
| Nitrate | Below 20 ppm |

Credit: www.fishlore.com
Behavior and Temperament
Glass catfish are gentle and peaceful. They do well with other calm fish. Avoid keeping them with large or aggressive fish. These can scare or harm glass catfish.
You will see glass catfish swimming in schools. They often hover in the middle of the tank. This group behavior looks very nice. They sometimes hide when they feel scared.
Good Tank Mates For Glass Catfish
- Small tetras
- Corydoras catfish
- Guppies
- Rasboras
- Snails and shrimp
Fish To Avoid
- Big cichlids
- Barbs that nip fins
- Aggressive or territorial fish
Health and Common Problems
Glass catfish can get sick if water is not clean or if they are stressed. Watch for signs like hiding, not eating, or strange swimming.
Common problems include fin rot and parasites. If you see these signs, check water and improve it. Use medicines made for fish if needed.
Tips To Keep Glass Catfish Healthy
- Keep water clean and stable.
- Feed a balanced diet regularly.
- Keep them in groups of six or more.
- Avoid sudden changes in water temperature or quality.
Summary
Glass catfish are peaceful, beautiful fish. They need groups of at least six to feel safe. A tank of 20 gallons or more with plants and hiding spots is best. Feed them a varied diet of flakes, pellets, and live or frozen foods. Keep water clean and stable. Choose calm tank mates. Watch their health and behavior often.
With the right care, glass catfish will live happily in your aquarium. They add a special look with their clear bodies. Enjoy watching their schooling and calm swimming every day.
Frequently Asked Questions
How Many Glass Catfish Should Be Together?
Keep at least six glass catfish together to reduce stress and encourage natural schooling behavior. Groups of six or more ensure they feel secure and active. Smaller groups may cause them to hide and become reclusive, affecting their health and display in the aquarium.
What Size Tank Does A Glass Catfish Need?
A glass catfish needs at least a 20-gallon tank to thrive. Keep a group of six or more for comfort and natural behavior. A spacious tank reduces stress and promotes activity.
How Do You Take Care Of A Glass Catfish?
Glass catfish need a peaceful tank with at least six fish in 20+ gallons. Feed varied, protein-rich foods like bloodworms and brine shrimp. Maintain clean water at 75-80°F and low lighting to reduce stress. Provide hiding spots to mimic their natural habitat for best health.
What Should I Feed My Glass Catfish?
Feed glass catfish high-quality flakes or pellets, plus protein-rich live or frozen foods like bloodworms, brine shrimp, and daphnia. Offer slow-sinking foods for easy mid-water feeding. Vary their diet to ensure balanced nutrition and maintain their health and activity.
How Many Glass Catfish Should I Keep Together?
At least six glass catfish should be kept together to reduce stress and encourage natural behavior.
What Is The Minimum Tank Size For Glass Catfish?
A minimum 20-gallon tank is recommended to provide enough space for a school of glass catfish.
What Water Temperature Do Glass Catfish Prefer?
Glass catfish thrive in water temperatures between 75°F and 80°F (24°C to 27°C).
What Do Glass Catfish Eat In An Aquarium?
They eat small insects, crustaceans, and prepared foods like flakes or pellets.
