Ok, i am usually not one to post things in the wrong forum but.... I have freshwater stingrays so i am putting it here, Is brown alge bad for stingrays, I would guess not and that it just looks bad. I have a bare bottom tank and it has been very clear for months..all of a sudden i am having a brown alge explosion, I can clean my tank and in 2 days it's coveren again. Looks like **** when people come over. What could have changed, or what can i do to get this under control......PLEASE>>>>>>>>