Would it be possible to get some dry rock that would have high levels of something (minerals of any sort) that could leach out and cause any kind of problems? I'm having a long running sps issue and the only possible thing I can think of is rock or sand. My fish all live, polyps check, but anything with a calcium skeleton either does not do well or in the case of my sps it puts on tremendous girth and encrusts but never branches. It's quite ugly actually. I also have never had luck with any inverts. 90% die within a week. This is a 3 year problem.