I have Brown algae ,too as i have a new tank. My red tailed black shark is having a good time scraping it off, all day! Plus, i just bought 3 siamese algae eaters, and they are joining the fray! I agree with dragon about brown algae and too little lighting. I just changed my cool white lamps to triphospor, and two phillips light calld Aquarium and Plant and the other one is ultralume.