I know with most people it's the opposite. But my tank has no algae... I recently added a coraline covered rock to seed the tankfor some purple / pink growth.. I started with BRS Pukani dry rock and I figured the leeching phosphate would start an enormous algae growth, but so far it's almost nonexistant with the exception of some real thin layers of a green film in some areas near the center of my lights. My tank is 125 g and I have 3 kessil a150 15k's. My tank is 5 months old and is currently fallow due to an ich outbreak. I want to add some tangs and fish that like green algae such as dwarf angels. How can I get more green algae growth? My refugium has a significant growth and i'm thinking it's because of low flow and the spectrum there is 10 k. Do you think turning off my power heads in the DT for a few weeks will help? I'm also using RO/DI water with 0 TDS... I figured that is keeping the algae away also. I'm afraid to add declorinated tap water because I feel that may turn into cyno... not sure about that though. I have already gone through my diatom bloom and everything has been settled for a couple months now.