Large sps colony dying from the bottom?

[Animal-Chin]

Cut the entire underneath off and gave the rest a good dip. Not one critter fell off so its not pests. Hopefully the stuff I cut off lives, I guess we'll see tonight. Alk is steady at 10.2 so it's not the issue. I moved whats left away from the hammer coral to see if it was being stung.

ah well, I have nice frags of it in my frag tank, I can always start over. Plus open realistate is never really a bad thing when you have a visa card...lol