Not taking any risk i just removed that one and get my self a non toxic tree thank you for the advice and letting me know......All oak leaves are toxic when green. They lose some of their toxicity when they turn brown and fall off. Most of the time tortoises won't eat oak leaves, but it is a risk.
I highly recommend fruitless mulberry. Full shade and lots of good food in summer, full sun in winter.Not taking any risk i just removed that one and get my self a non toxic tree thank you for the advice and letting me know......