Recently my 210 has had a little algae growing on the glass (not sure which species, but it's the type that's really hard to scrub off). I can't think of any fish that will eat it, so I'd like suggestions. I also wouldn't mind a few fish that stir the sand. The only fish I can think of that sift through sand are Balas and Geos, although I don't want Geos or more Balas because of their bioload.