My pacman (small) is healthy in every way except for he looks really deflated. Even after feeding, he doesn't puff up, he's just deflated but with food in his stomach. I thought it was starvation but I've fed him 3 pinkies and a large cricket. He's also freaking out in the sense that he's so scared of me that when I come near he'll jump frantically against the glass. He used to be relatively calm, but i don't know if this is related to the deflation. What could this be?