Hi Guys,
I have some hair algae starting to pop up in my tank. I had a problem last year with hair algae, but has been gone since then. My tank is 150 gal sps tank with 3 250-MH that are 6 months old. I have a sump/refugium with chaeto and 200lbs. of live rock, BB. NO3 = 0, NO2 = 0, PO4 = 0...