Is that possible? I have a mag 9 return pump on my waterfall design. Comes from the overflow box directly to the sump. My question is for a 8x8 sheet..is that too much? I am getting greener growth after i switched to a double sided and stronger lights...but still have a bad hair algae issue. I have 2 23 watt cfls on both sides. and feed pellets 2x a day. I clean every 2 weeks. Getting good growth but tank seems to neither improving or getting worse. Any ideas? Thanks!