I purchased a frogspawn coral from my LFS several weeks ago. I noticed recently that at night it leaves it's mouth gaping open for multiple hours (sometimes longer) and then sometimes it will stick it's mouth up in a kind of pucker (really weird). During the day he seams perfectly fine. I am not sure if this is because he is sick or trying to feed or what. The pictures are below (one of each stage), I would appreciate any help. Thanks.

