I've had the turtle for about 3-4 weeks now. I took it from my cousin who was treating it terribly. He's very active. Moves around, swims, and loves to walk on your hand. But for the last couple of days, he's been acting a little different from the time i've had him. He just sits on my hand and opens his mouth for a bit. Then he closes it. I'm just wondering if it's something i should be concerned with or not. I feed him some Commercial Pellets every couple days, and he usually eats them. Any ideas if he is fine or not?