So ive been using Golden Pearl on my SPS for a couple weeks now and my corals love it! I am getting great polyp extension and my pink millies are getting very bright. Pinks are one issue i was worried about with the LEDs but now im getting great color from the pinks and reds as well as everything else. my tank has been doing better so im sure its not just the food. The only downside is I dont know how much to feed this stuff. Its a fine powder and use about a teaspoon. I have been getting some phosphates but i think its because im using too much. anyone else use it?