Got a few sweet frags of pom pom xenia from autochek this past weekend but they don't seem to be happy. He had them on the sand in his tank under MH lights. I placed them in the sand as well under VHO (shallow tank) but they seem retracted. Everything else is opening up nicely. I tried putting it in high, medium, and low flow areas but nothing seems to work. The polyps are pulsing but they are retracted. Any suggestions?