I have a large turtle pond (which has barriers around it so the turtles don't escape and go into the fish pond or wildlife pond). In it I have 4 red eared sliders, 2 yellow-bellied sliders, 3 unknown painted turtles, 2 red-bellied turtles and 1 cooter.
I have four red eared sliders in my pond, I also have a bunch of koi and large goldfish in the same pond too. But for some reason the turtles leave them alone lol.