Above normal salinty. When I had a salinity problem due to a bad hydrometer the first things to go were my snails and shrimp.
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That is a problem.
Because the other critters are less sensitive to less than ideal water quality. Even many corals, like a lot of soft corals which I assume is what you have if you don't have test kits for parameters like calcium and alkalinity. Nevertheless, what are your nitrates at? You can't answer that without a test kit.So what could be the problems in the parameters that I don't see? My point is, no matter if I have a test kit or not, other critters and corals in my tank are still doing well but the cleaner shrimp.