How can I tell if my turtle's shell is starting to become deformed? Like, starting to curve upward. I don't know if he's always looked the way he does or if I'm just being paranoid because I keep reading things. He's about the size of a quarter, in a 10 gallon tank next to a window with natural light. He has a filter and a heater for the water. Also, some rocks to bask on. I've had him for about 2 months. I've included four picture links of him, to show as best I can. So, am I just being paranoid or does it look weird? Thanks.
http://img339.imageshack.us/i/dscf2418.jpg/
http://img440.imageshack.us/i/dscf2419.jpg/
http://img229.imageshack.us/i/dscf2421.jpg/
http://img440.imageshack.us/i/dscf2423b.jpg/



