Sorry! I don't know anything about turtles, but I DO know my herbals, and Tea tree is one of the best out there. I use it daily around the house, and ever since discovering Melafix, I've been wondering about how or IF it can be used in my trops tank in a purer/home-made form (hoping that I'll never NEED to use anything ever again, lol!) I'm really interested in what information you have regarding how you've used this oil in the past? Care to enlighten a curious soul?
Good luck on your turtle questions, wish I could help!