HELP!!! hair algae. 1 year old 75gal, MH's, 55lbLR, RO/DI water, trickle filter, Remora skimmer, Magnum with Black Diamond Carbon, 0.5"-1" of "Special Grade" aragonite from CaribSea as substrate, water change every 3-4 wks, 74-78F, ~1.023, 8-9 KH, PO4~0.1 or less (but increases near water...