I know there are previous topics about shell problems. Just want to get more specific help on diagnose the problem for my red ear sliders.
They have white spot on the shell for about three weeks (pls see pics in attachment). The white spot won't go off when washed and the area of that shell remains hard and smooth. Their other habits seems to be fine. They eat well. Although I left their heat lamp and uvb light on for more than 10 hours a day, they do not bask too much, less than two hours a day in total. I change water for them twice a day use pipe water from yesterday (should not have too much CL left).
What shall I do to treat their problem? Thanks a lot!








