
Worried about shell rot
Hi I inherited a juvenile red foot tortoise a couple months ago. He was being kept indoor, no lamp, no supplements, no soaking, just fruits and veggies to eat.
I've had him outdoor in Florida in an enclosed cage with sun, basking stone, pool on cypress mulch. Getting calcium powder. Shell seemed really soft when I got him but seems better on top now. There's a lot of rain here but mulch dries out in the sun after so the top layer is never soaking wet.
His underside has looked off to me since I got him but I don't really know what I'm looking at. The darker patches in the lower middle are relatively soft. No smell though.
Does this look like shell rot? Also, bonus question, any clue how old he might be?