I have a leopard tort that seemed fine but the underside of his shell is soft. What are some of the causes? I give him repti-cal & minerals on his food. He keeps his eyes closed. But he is gaining weight 27 grams. So he must be eating when I'm at work. Gets daily soaks, basking 92 degrees, 80% humidity, 80 degrees other part of the tort box. The other tort doing fine. I'm spraying his underside with vetericyn vf. Even the sides of his shell are getting soft. I say he just because, have no idea really. 10.0 uvb tube light. Thanks for you help!