So I've had my reef tank established for over a year now and when it was still new I bought a cleaner shrimp and it disappeared so a couple months later I tried an arrow crab and the same thing happened then to a coral banded and just last week another cleaner I took my water in to get it tested (I'm partially color blind and can't read my own tests) and the guy at the fish store told me my water is perfect except my alk is a little high. All my coral is thriving even my sps and lps what could be killing my inverts