We found this turtle in my friends pool. There is no chlorine or anything its just dirty water. It has pretty bad shell rot and its under shell isn't fully developed. Im thinking maybe from malnourishment. What can I do to help him get better and to help his shell rot? I would really appreciate it if someone could tell me what kind of turtle it is. We think it is either a baby snapping turtle or a baby musk turtle. Any help is appreciated.

