1. Some alien fish, such as scavenger, rat fish, golden beard, panda loach, sail, etc., can clean the excrement of fish tanks, and black shell shrimp also has the ability to clean the excrement of fish.

2. However, it is worth mentioning that no matter what animal eats fish dung, it will also have its own excrement, so it can only be managed temporarily. If you want to keep the water clear completely, you still need microorganisms to decompose these excreta. If you want to reduce the amount of feces, you can feed less food.