Like kellehar said,
It'll probably come back fine. I had a piece just a couple of weeks ago that got knocked down underneath a large rock for a few days (while I was away) so it shrivelled up to a spec practically and came loose from the rock, I superglued (gel) back to a rock and its opening up again. MUCH smaller than before but it looks like it'll come back.
I'm sure your's will too if especially since its still moving.
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-Mike (Tank Info / Links / Pics shown below)
120G Reef with 2x250W MH lighting
My old 33G Reef with 192W PC lighting
Live Rock - These tanks have some purchased liverock, but mostly home made live rock
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