I have snails and Sterbai Corys as clean up fish in my new 6' tank. I would like to add another small Algae eater to the tank while it is settling down. I would like a sucking Catfish to help with glass cleanup, but didnt want something which would grow huge and suck on the Discus or grow too big for a predominantly Discus tank. Which smaller Cats would you recommend as an Algae eating catfish to cover the areas the Cories and snails miss while the tank cycles for Discus?