Blasto question

I got a blasto frag about 2 weeks ago. Drip acclimated and has been doing very well, at least I think it has. It has opened nicely, and is extending its tentacles at night and has accepted 2 feedings of mysis. I came home from work yesterday and a small part of it was a little drawn in. There is no discoloration or damage that I can see and it is still fully opening at night to feed. Any ideas on what this could be?

Placement in the tank is in the lower half, with moderate flow

Water params:
am-0
ni-0
na~5

Ca 400
Alk 10

30g long tank with 4 39w T5ho 2act 2daylight 10k

thanks for the help in advance

 

Something could have fallin on it and made that part of the blasto deflate a little, or it just decided it would randomly close a little. I would not get worried about a coral unless its been close for a few days and not looking the same coloration and stuff. Corals are weird in what they do. So just let it sit, im sure it will open up shortly again. I have a HUGE welso that opens part of itself and the other is somewhat deflated, but ive had it for a while so i know its fine.

 

Something crawled on it and ticked it off