I'm going to try it one more time, I've tried to put Xenias in my reef tank, but in a couple of days they melt away, I have a 135g tank, 4-96w pc and 2-250w MH lights, I've tried putting them on the bottom,middle,and the top, The last ones I got came from a tank that had 400w MH lights, so I thought they would do ok, Someone said my tank might be to clean, Don't under stand that one, I think I'll try leaving the MH lights off for a awhile and bring them back on a little at a time. any suggestions would be helpfull.