There is prety much no algae problem in my tank and it sits in direct sunlight for most of the day, If I increase and decrese feeding of my mbuna I can get my algae as long as 2 inches in little hairs, but less food and this disapears in only a few days. I do have a permanent algae layer, but think this is more do to sun than the fish a pleco could doubtfully make anymore difference, when the tank was newer the algae oculd have disapeared entirely.