I just bought about 15 of these on a rock, but for some reason they dont seem to open up in my tank. I put them on the bottom of the tank because I'm afraid my MH would burn them, but I had them under Power compacts before and they still wouldn't open . My other corals open big and nice , like for example: green star polyps, green carpet anemone, frogspawn, different type of zoos, and a neon green flower pot. I think one of them already died, cuz it fell of my rock when I tried to move them. They were oozing some liquid from their mouths. So I dont reallly know whats wrong with these guys. Any ideas? thx