I have had my 90g reef up for 6 months. Currently running 2 110 uri VHO's, 2 175 10K german metal halides, 100 lbs LR, and Berlin Classic Skimmer. The past 3 monts I have a major hair algae problem that I can't get rid of. Its so bad if I add a hard coral the algae starts growing on it right away. Nitrates are about 40 and won't go down even with 15% water changes every two weeks. Any suggestions would be greatful.