Thanks ALang!
I
wish I was at LNS, but I'm still making up for being away for most of the last year and a half. The tank has really suffered in that time. There was a layer of detritus on the sand, and a layer of cyano on top of that! I cheated and used ChemiClean to zap the cyano a couple days ago. Now I'm at home permanently I can do the maintenance on the tank and get it back into shape. It could be the toxins that cyano releases that were affecting the LPS. Combine that with a lack of carbon, and that could be the issue. Fresh carbon a week ago, fresh GFO today...things should be turning around soon!