From the video, he looks very skinny, maybe it’s just a refraction from the water but he should be very round in the mid section. If he ate a fish the day before there is a good chance he is somewhat full. Might also get scared when being moved to a feeding enclosure or frustrated from missing the food several times before. A couple of mine will take food a second after being handled, one might even eat when being held, never tried, but the other two need a while to calm down. Sometimes they have difficulty catching their food, I’ve gotten good at popping the food in the mouth of the one that doesn’t do well on taking a second strike, he will will open he mouth just a little several times after missing, so I can slip it in if I’m super fast and prepped just right. On another I’ve just learned how to hold the food to maximize its ability to get ahold. Another response technique that works for me is dragging the food over top of their front foot.