John,
IME, Yes 6 to 8 inch CC eat small fish. I've raised them from 4 inches in aquariums on guppies and then FHM when they hit about 8 inches. They will eat what they can get in their mouth's and instinctively prefer live food....after 9 weeks yours are probably 8 to 10.
I sense your skepticism regarding 6 to 8 inch CC eating small fish and that is cool, just giving my experience. Hopefully, one of the pros will chime in with an opinion that will be helpful to you.
Good luck. Please post back what you find out with regard to the status of your CC.
Bill D.
Last edited by Bill D.; 05/08/17 06:39 AM.