Alright, I've been fighting this algea for a lil bit now and I'm giving up. I do weekly water changes with RO water, I only have 1 fish in the tank now, its a 15g with mixed corals and 2 clams. I have a top off hooked up with a DIY kalk reactor, an Aqua C remora and pleanty of flow. I have about 25 hermits and 15 snails give or take a few but they dont seem to touch it. Prolly last month I took a ot of the corals and rock out and pulled crap load of this stuff out of the tank and now its returning. Is there anything that I can add to the tank to help rid of this? Phosphate - under .05 and I feed every other day. Any suggestions?