Can anyone help me? It has been in the tank a week now and I have never seen it open...I have it in a low flow area and I don't have any fish that would bother it...does it look ok? I've been trying to spot feed it plankton...I've also smelled it and there's no bad smell like when a snail dies...salinity is 1.025 ammonia 0 nitrite 0 nitrate 5...my other corals are all good...I didn't check mag cal etc yet