Has anyone had the feeder fish in the tank attack their turtle? I have some very large minnows that were never eaten that are now constantly harrassing my turtle by nipping at him. They nip so hard it actually moves him in the water. Is this some sort of symbiotic relationship or should I remove the fish from the tank? I did notice some shedding on his back legs and tail and I am wondering if maybe the fish are helping to remove the dead skin? Any advice would be appreciated.