Ok ive changed my light bulbs (twin T5s) , ive checked for po4 and NO3 both show 0 mg/l. i do weekly water changes (r/o water) ive checked the ro water for po4 and no3 also (zero) I have macro algae (caulerpa) growing in the main tank, to help with nitrates. I dont feed the fish too much (maybe 3-4 times a week) I have 2 common clowns and a lawnmower blennie, so not over stocked. i run active carbon and po4 removal media (in a reactor) and i have a good protien skimmer. ........SO WHY IS MY TANK STILL 90% GREEN WITH ALGAE????? PLEASE ADVISE, HELP, TEACH!!