Kevin's given you great advice. He is after all the SPS Guy!!! As he mentioned, your Leather Corals are quite toxic towards SPS corals. I have a Leather and Toadstool in my 75 with SPS. In fact, I've also got GSP, which is just as toxic, if not more so. I run carbon in a media sock in my sump. I do have a canister filter that I don't use and should think about using it instead. It'll be a better carbon filtration method. Lots of carbon, lots of good flow, good skimming and frequent water changes will give your SPS a much better chance.