Just thought I'd show you how industrious my little dudes are. As soon as I put a plant in to 'float,' they are all on it cleaning up whatever yummy bits of algae (that I can't see) might exist.
In fact, I moved a C.Parva from my 55 yesterday, which had a bit of BBA on it, and it is almost clean today (just about 1/4 inch area of BBA left on it). This is despite the fact that I overfeed them! Love'em shrimpies!