So I help my mom with cleaning her 5 gallon tank quite often. She has a 5 gallon tank, originally it was for glofish but after 3 years they finally passed Now she has a couple of white cloud minnows in there and they are doing great! Problem is, she has always had an issue with algae. First it was green algae, which I know sometimes can be from lighting so we took care of it and it went away. Now her big problem is brown algae. I have no clue as to how to get rid of it! I even, which I normally would never do, scrubbed the entire tank down top to bottom and still, the brown stuff. It's to the point of we're upgrading her to a 10 gallon and starting fresh. I know her water is okay because I've tested it...so does anyone know why or where the brown comes from? And how to stop it? I read somewhere it can be do to excess waste? Any ideas are appreciated...sorry for the long post!