i know the turtles will probably eat them but will they have a go at the turtles they are only 15cm length carapiece as well as the water dragon that swims in there.
Yes, just make sure they arnt big enough to kill and eat the turtles and vice versa if you want the crays to survive. I dont think its worth putting them in though, they are just as messy as turtles.
just make sure the turtles arn't small. I found a yabbie holding my turtle at the bottom of the tank. I got there just in time to stop it from drowning her.