Do turtles and fiddler crabs fight?

Most turtles will eat fiddler crabs. When I got my turtle he ate everything that moved (fish, fiddlers, and a snail) Recently though, he hasn't touched any of the fish and prefers to eat the turtle sticks and freeze-dried shrimp treats. I bought two fiddlers yesterday and they seem to be getting along just fine. If you buy a bunch you can use them as food and a cleaning crew. A nice little snack for the turt and a clean tank!