Need some help with my Maxima clam

[chwkreefer]

Hi,
I have two crocea's that are looking great. The Maxima was too until last week.Now I can just see a portion of the mantle coming out and the clam is pretty much closed.

I check my parameters about 2 weeks ago and they were all good. For those of you who don't know my tank it's a 150 sps dominated, and have 2 - 10K MH 4 months old

I'm looking for some direction as to what to look for. In regards to measurements for mg, cal, alk, pH etc, assume that they are all good. Although the tank got up to 84 degrees for me for a number of days for me. Mine rarely peaks past 80.

But if you can point into some directions to look Iwould be greatful.

Bill