I have to thin them out at least once a year. Them things grow fast and fat on my 46% fish food. Plus they try to eat my prized corks. I Just use a Crossman .177, no props. Not worried about a head shot. If the shell is cracked, they are a gonner. They later float up, net them out and leave em for the buzzards.

It is fun. Sorry, stinkin slider huggers.