Our tank is so over run with hair algae I am ready to break the who tank down and start over. We have a 90 gallon display with a 55 gallon sump. Phosphates and nitrates are 0. RODI was is free of phosphates and nitrates. Feeding the fish twice per week. We do 10 gallon water change every week. And it is over grown with hair algae. Nothing we do has helped. I will get some pictures up when I get home but we are at our wits end..