My smaller res has some clear white stuff (looks like skin) coming off near his neck, tail, leg, and pretty much anywhere the skin is exposed. Is that normal? Is this a fungus infection? Two weeks ago he was perfectly fine. None of the setup or anything was changed.

Secondly, both my turtle shell color has turned from green to somewhat patchy white and green. Is that shell rot? mineral deposit? I'm pretty sure this is a cause for concern. Please help. I've since separated the two just to see what's going on.

thanks
Allen