"Scavenger" fish is native to Latin America and belongs to Silurus, also known as sucker fish, miscellaneous fish, anglerfish and anglerfish. This scavenger was originally introduced as an ornamental fish, with strong viability, strong physique and easy to raise. It is an omnivorous fish, which sucks algae, benthos and garbage in the water, and can also swallow a lot of fish eggs and fry. In the aquarium, it is often adsorbed on stones and glass to stabilize the body, suck algae, and look for benthic animals (such as water worms), which is a loyal beak in the aquarium. It belongs to nocturnal fish and can be mixed with healthy fish.

Instead of eating fish feed, it swims around the bottom and sides of the fish tank. The place where it swims is particularly clean. I found it. I finally found it. I found that the mouth of the sweeper sucked fish excrement and green plants into the stomach like a vacuum cleaner. There is also a bubble in its mouth. This bubble contains oxygen, which can make it stay in the water for a long time and make it eat more "food". No wonder it's called a scavenger! I looked up the encyclopedia again, and this book confirmed my findings. Scavengers mainly eat fish excrement, seaweed, bacteria and feed residue.