well, with any type of pleco you only need one (commons need 55 gallons minimum) because they are huge waste producers, hence they carry a large bio load. I don;t suggest getting one. I would suggest some time of corydas cats or a school of ottos. If you decide to get ottos make sure that you are NOT I repeat NOT purchasing Chinese algae eaters, they become very big and very aggressive. members here cam back me up on this one! what size tank is this for? that helps us out a ton! hope this helps! -fishlover78
