I have a fire shrimp in my tank and it is upside down moving it's legs in a weird way. It molts about once a month but I've never actually seen it molt, just saw the shell. He is out of the cove he is usually in, but I never find the shell in his cove so it might not be a big deal. Is he molting? Or is it dying? My water parameters are stable, corals and fish are doing fine. Did a water change earlier this morning and added a clove coral last night along with a small serpent star.