We have a RSM130 stocked with LR/LS, all sorts of corals (soft, LPS, SPS, etc), a few fish, some crustaceans, and of course a CUC. Anyway, we are ALWAYS adding Calcium, Buffer, and Magnesium. We do weekly 15 gallon water changes and use Oceanic salt. We've tried Tropic Marin and Instant Ocean...