I use coralife salt most of the time. My sps, clams, fishes are doing well. I never bother about my clams so much as I know they are doing well. There are lots of floating food or debris which the clams can pickup. I feed my fishes with Henry's food once every 2 days. Dose GP every 2 or 3 days. My water parameter Ca=430, kH=10, Mg=1400, PO4=0, NH3=0, pH=8.0, Sg=1.025....