Yea that's what happened in my 29g.. That's why i haven't been on here in awhile b/c i was about ready to throw in the towle b/c when my nem died it killed about 75% of the stuff in my tank! all my fish died and most of my corals, after a few big water changes it didn't seem to help any so i just left my lights off for a few days not caring anymore, then one day i turned the lights on and the few remaning corals were opened up and i was like wow there something alive in there lol, so i did a few more waterchanges and everythings doing great again! soooo.. no more nems for me if and when i get some clowns they will find something else to host! lol