hi i was feeding my endli frozen fish earlier today and i noticed he was approaching a piece of fish but his mouth was closed. a while after he wasn't noticeably full. and i noticed my othe polys noticeably pump water over their gills even when idling causing the mouth to open and close slightly. this endli, nothing, his jaws stay shut. im worried he might have his jaws locked shut or maybe im just freaking out. thanks in advance.