So the glass on my 15 is covered in hair algae, at least I think it's hair, (I like the look, and my angel picks at it from time to time) and I have 3 otos that I recently added expecting them to contently munch on that, but they don't seem to be touching it. Do they not eat hair algae? If not I'm worried that since it literally covers the glass there isn't enough of the algae they do eat in there (I have algae wafers but I don't want to supplement their diet if I don't have to). Thanks