Considering their adult mass, am I stuck at five? I'm thinking of maybe a small pleco species, but that would be it. No real plants, all fake. Two HOB filters, penguin 170 and penguin 300. Weekly W/C of 30-50% depending on nitrates, and light feedings of many types of food. Temp I'll probably raise to about 80ºF, currently at 77ºF. I'm thinking of a grab bag assortment, like one of each of the commonly available strains. I'd hate to get a pair formed that makes mutts, though. Maybe I should go all one type. Any ideas?