We leave the entire back and side of the 65 uncleaned, as well as the rocks, overflow box, ect. There are not any other fish in there that eat algae, and I worry that it's not enough. We have another tank that he can be moved into if needed. I class these guys as a worker fish--they are beautiful, and great personality, but if you can't provide it with a long term job, don't get one. Kind of like the aiptasia-eating nudibranchs.