None. Turtles eat any fish. If the turtle is small, and the fish is big, it may work for a little while (like a month), but it's not recommended..

I agree. No fish is safe with turtles! If you want to try it though, I'd recommend purchasing feeder goldfish. I have seen turtles live peacefully with large goldfish.. and if he decides to eat them some day, you're only out a couple bucks.