Please relocate that turtle where it was before. Where did your aunt find it? Just try to put it back where she found it (Unless she found it in the middle of the street).
I use about 2' inches of substrate, and I would recommend getting a bigger enclosure for him. A 16 gallon terrarium won't cut it. An ideal enclosure would be an outside pen, or a tortoise table of some sort.
While I was feeding the torts, some Sphagnum moss found its way to the feeding rock I use, and of course they happily munched on it as if it were lettuce. I just need to know if this is harmful for them.
Thanks.
(I have no idea why I posted this in the enclosure forum, my mistake. If an...
I would try to entice him with some fruits, (apples, strawberries, tomatoes...etc) but make sure not to feed to much. Think of it as a treat you would give to a dog. :)