Hi all, I have a RES and I have noticed more "white spots" or discolouration appearing on its shell. I have spent a lot of time researching on whether it is shell rotting, fungal infection, but to no avail. It has been a few weeks, nearly a month since I've noticed the "white spots" or discolouration on the shell. My RES shows no sign of sickness or tiredness, eats a lot, and is very active.
Please advise, thank you!
Attached are the pictures I have taken when they shell is dry.