My yellow bellied slider keeps opening and closing its mouth while under water....
I have two yellow bellied sliders that I've had for approximately 4 months. I'm worried about one of them because it is continuously opening and closing it's mouth (I don't notice the other one doing that) .. so I'm thinking it may indicate there's a problem. Everything else seems normal, it's eating and is active (not as much as the other one however). Is this something I should be concerned about?