Montastrea Corals not opening

What would casue a LPS (Montastrea sp.) to inflate its flesh at nightime feeding but not open and expand?

I have a 90 gallon system:
http://www.reefcentral.com/forums/showthread.php?s=&postid=9763827#post9763827

The corals are pictured here:
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1095852

I have eleven of these frags in a 90gal. I did rearrange my rockwork last week, which required removal of all the corals and replacement. But this issue goes back to before the reaquascaping. Also two of frags are already fully opening, four of the partially opening and five of the 'inflating'.

Additionally, I have a red Montastrea that inflates at feeding.

I have no tissue recession that I can see all the tissue appears healthy.

The corals were acquired about six weeks ago from www.fragglereef.com

The tank is lit with 2x150MH DE 14kk lamps and 2x110 VHO actinics. The MH are 15" of the surface of the water to acclimate. I have not dropped them because I am still waiting to see that everyone is acclimated.

The tank is fed nightly with Cyclops, Mysis, Brine Shrimp, DT's Oyster Eggs and Phyto.

All the Nitrogens and Phosphates are 0 with minimal algae in the tnak. Alk at 3.25meq/l, Ca at 420ppm, Mg at 1280ppm.

Any ideas?

Chris
 
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