Your kuhli loaches keep dying because of one of the following problems:
- Suboptimal water temperature
- High levels of ammonia, nitrate, or nitrite
- Water pH too high or too low
- Aggressive tank mates
- Bacterial infections
- Not enough food
Kuhli loaches are sensitive to their environment, so any sudden changes or a hostile environment can cause their sudden deaths.
To keep your kuhli loaches happy and healthy, you must fulfill their needs.
First, monitor and maintain the water parameters. Then, clean the tank regularly to prevent water poisoning. Also, avoid overcrowding the tank or housing them with aggressive tankmates. Last, provide them with enough sinking foods that are suitable for bottom-dwellers.