True, very true. My piranhas have been living with my pleco for almost 2 1/2 years now...the only advice that I can give you is do your water changes frequently, keep them well fed, and provide enough tank space.Pfisherman;3345578; said:the thing you need to realize is that a pleco is not going to be a "janitor" they add as much bioload on your aquarium as any other fish. People always thing that they eat the fish excrement, such is not the case.