So far I am trying Phosgaurd (Seachem) to try and reduce the silicates. (My phosphates are 0 already). All this seems to have started when I started dosing with Seachem's Reef Advantage Calcium, but I'm not sure if this is just coincidence. Just to be on the safe side, I have stopped dosing with the calcium. I will let you know if I see any changes.