tortoise shell plastron

Hello everyone, first post here so my apologies if this has been covered. I have a young 9 month old Redfoot, I bought him when he was around 5 months. His plastron has always had this weird texture and color, his terrarium is always between 75-90 in his basking area. Humidity is between 70-85...

Hello guy, i need some advice about tortoise shell. It appear to have round mark under my leopard's plastron. I don't know if this is shell fungus or not. Is somebody know what are those marks is ???