Sometimes called the "janitor fish" or "sucker fish" these helpful species can help keep tanks clean as they are natural scavengers. They are bottom-feeders and will eat uneaten food or other leftover matter that would otherwise cause harmful nitrates in the water.

Do janitor fish clean aquariums?

Janitor Fish, also known as Pterygoplichthys disjunctivus, are small and spectacularly colored which makes them great for aquariums but be warned before you use them in your pond. Though they do clean ponds they can harm other fish and are invasive in some environments.

Is janitor fish harmful to other fish?

"The 'janitor fish' is harmless to man and other fishes." ... Scientiffically called Hypostomus plecostomus, the fish is an imported species of freshwater catfish native to South America.