I have a 240 long with three 6 inch motoros and a 5 inch tigrinus. I am using an old dual 6ft VHO lighting system that keeps the tank pretty brightly lit. The only problem is that I get a dusting of brown algae on everything. I have the tank decorated with three little piles of large river stones with fake plants poking out from them. It looked great when you could actually see the details of the rocks. Now it looks like big hunks of chocolate in a sea of tan sand. The back glass also gets a covering of algae that I really can't get to. Any ideas? I know that plecos are a possible problem, so they are out. Otos will just be food, chinese algae eaters too, how about apple snails or mystery snails. Will they just be expensive stingray food?