WHEW, what a pain. Lost my large valida colony (I managed to frag a HUGE piece) and my other green with blue coralite and polyp stony colony. Still have a colony of purple that's fine the Paletta Lovelli right next to it is fine and the blue tipped valida is fine. I think I needed more flow. I believe Jack remarked about it... Since one of my K4s snapped at the post, there is much less flow now so I added a crappy little powerhead over on that side of the tank and the blue tip is polyped out ALOT now.