Raising black-shell shrimp or snails can clean up the feces in the fish tank. It should be noted that although many merchants will say that scavengers have the ability to clean up feces, this is not the case. Scavengers mainly clean up the residual bait that falls under the water, and they don't eat feces, and their excretion is also very large, so they can't improve the water quality at all, but only treat the symptoms but not the root causes, so they still need to clean up by other methods.

1. Scavenger: Scavenger is a common tool fish. As mentioned above, it can clean up the residual bait in the water, so it can improve the water condition in a short time, but it will not work after a long time. This kind of fish lives underwater and belongs to a kind of special-shaped fish. Its shape is not very beautiful, but it is easy to raise.

2. Golden moss mouse: Golden moss mouse is also called moss mouse, and it is also a common tool fish. It has a mild temperament, can be mixed with many small ornamental fish, and is suitable for survival in the environment of 15-30 ℃. However, this kind of fish will only eat algae when they are young, but they will not eat it when they grow up, and it will also endanger the health of other fish, so it is best to clean it up.

3. Elf fish: Elf fish is a tool fish that eats algae. It is small in size but efficient, and it is perfect for cleaning algae in fish tanks. But when there is no algae, it will die because there is nothing to eat, so it is best to feed some artificial diet containing algae.