That sounds pretty good providing you are using good quality sticks.I suspect they might be lacking in vitamins or something in order for the shell to look like that.Hopefully other turtle keepers will chime in.I feed them with dried shrimps and stick food and they get some sun light in the morning.
I believe so but you must first find out exactly what it is....keep up the basking in plenty of sunlight in the meantime.Can i treat this ill?