My first concern is that my Soft-Shell turtle is not eating much. And now I saw something else...When I checked on him yesterday night I saw some small wrinkles on his shell. Can it be caused by lack of calcium?
He won’t eat turtle food. I have been feeding him crickets and sometimes small pieces of raw meat...but like I said, he is not eating much. I've tried live fish and he won’t eat them either.
Can it be cause by not receiving direct sun light?
Should I put UV light on him?
Other than the wrinkles on his back he looks physically fine...he has clear eyes and nostrils. He is 1 year old.
I also have two red-eared on a separate tank and they are doing fine.

I appreciate your help!