naa , leave enough nutrients in the water (this does not mean bad water, do the water changes) and algae grow with some light. we fight it on our tanks all the time but not bad for the fish, we just not like seeing it, and if compeatly on its own the tank go dark because all glass walls covered, I use a rouge pleco on all my other tanks to clean them up, (yes he gets pleco chips and veggies also). he about 8 inches now, 14" retired to the 180 and the 4" going to take his place. was a bummer in another 4 weeks the rouge was going to have a feast.