My set up is as follows:
For substrate I use repti-bark misted with water daily, on top of that I have spagnum moss misted couple of times a day. I keep 2 undertank heaters on one side of the tank, but I do not use it under the tank, I have them on the sides of the tank. The temperature is about78 degrees. On the other side of tank i keep a shallow plate with water, wich is actually pretty big. I have shallow water in it.
I just got them 2 days ago, so the turtles are still getting acclimated. I have tried giving them worms, raw clean fish.
Let me know if I can improve what I am doing.