I've got a couple of chinese algae eaters that I need to get out of my tank. Didn't know they get aggressvie when they get bigger so I'm going to give them away (if I can ever catch them). Anyway, I'm not a big fan of regular algae eaters... are they necessary? I suppose I should have a bottom feeder or two. I've got a 75 gal tank and while I love clown loaches, I'm told my tank isn't big enough. Is there a type of cat fish I should get? Are there any that are good alone or do I need to get a small group?