Hey. I have a major problem with algae in two of my tanks. It is brown and is all over the sides of the tank. I don't know how to clean it all off without emptying the whole tank. And my snails and algae eaters aren't even touching it. I can't figure out why. I was away from the place for a week, with my parent's in to feed the fish, and it seemed to happen all in one week. Is there anything I can do? Why aren't my algae eaters interested, should I get a few more ottos? I only have one in my 29 gallon, could it be I don't have enough?