I have been losing snails (have a really hard time keeping them alive in my tank and it isn't just hermies killing them), also fish have a hard time staying alive in my tank. My corals are looking a little drab and I am not sure what is going on. I thought my corals were having such a hard time because my lights were so old but I have replaced those. I am not looking for a immediate change with those. I know they will take some time but why can't I keep my fish or snails? Here are my parameters from today! Phosphate 0 Ammonia 0 Nitrite 0 pH 8.4 SG 1.026 Nitrate 30 (It has been this way for months and I had a fish die yesterday that then got eaten by my Sally lightfoot) Kh 125 Ca 480 Does anyone have any ideas on how to help me?