I've had a 55 fish ony set-up with live rock for well over a year. Everything has been well except a stint with ick that got some nice fish. Anyway, I have a ton of green algae and I'm not sure how to get rid of it. I use RO water on water changes and this white floss stuff I put into my hang on that is supposed to help. The light is off most of the time and the tank doesn't really see sunight. What am doing wrong here?