frag starting to STN

[Haloreef]

Yep lost my Hulk acro in one night! Nothing else seemed affected. All test seemed ok. 2 days later my Rainbow Tort started to STN from the bottom up. I fragged what was left and crazy glued the exposed skeleton and that seemed to have done the trick. It was a small colony to begin with, not much left now.
I haven't lost anything in a week so... fingers crossed!