Question about short tentacle plates

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I just purchased a beautiful neon orange plate coral today and fed it some mysis 4 hours after I put it in the tank and now it is semi-deflated. I know that plate corals inflate from time to time, but is this normal. I have 0 Ammonia, 0 Nitrite, 5 Nitrate, 8.2 pH, 79F, 8 Alk, and 420 Calcium. Here is a picture:

2011-06-10 17.02.46 | Flickr - Photo Sharing!

I hope that there is nothing wrong with it. Thank you for your help.

 

[afettere]

hopefully it will do better than my long tentacle...see thread below

 

[Bald Eagle1]

It appears like normal behavior, but here a few things too watch out for, they can get injured by sharp objects, lighting is important for the long time health and decent circulation is crucial.
If you see the tissue receeding from the edges and not returning, then its time to worry. or severe deflation, to the point where the fleshy tissue is no longer apparent. hope this helps.

 

[catran]

+1- It still looks good. Mine shrinks and deflates every night and blows back up when the lights come on.

 

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I'm probably just freaking out a tad bit because of how much it cost. I will keep updated if it looks like it is getting worse.