I got this little RES, there are marks growing slowly on his top near the tail. Initially I used toothbrush try to clean the shell, but it does not seem to help. Now I can see some marks growing near the neck as well.
Is this fungus? If so how can I treat it?
There seems to be some marks on his bottom too, is that fungus or just scratches?
Unfortunately there is no direct sun in the apartment, I use a Arcadia D3+ lamp (12% UVB) on the top, with a 40W clamp lamp on the side to generate heat.
He is very actively and healthy otherwise, just bit off half of another smaller RES's tail last week.
Thanks in advance.

