I have several tanks three bowfront 46's one with 5 Tang African cichlids, the other with two Severum and two Convicts, the third deciding what to do with. Also have a 20 with ghost shrimp and guppies. Have fresh water clams in each. No algae problems at all and change about 20% water each week. Just like to stay on top of things is all. Pleco's tend to get big, are pretty inactive and looking for something that can survive in those tanks and keep things neat without taking up to much space.