Lets see what others have to say about this.
Double check that they were CNBG. Where did you buy them???
True or pure strain CNBG is copper nose bluegill that is adapted to southern climate and it is very very doubtful they will survive the Indiana winters especially as they get older and become more vulnerable to cold temps. You probably won't know for sure if they were CNBG until they mature and get the characteristic copper colored marking on the forehead. IMO if you truly received CNBG you wasted your money. Are you positive they were not hybrid bluegill HBG??
For some more information about CNBG see this from the archives and the part about coppernose:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92482#Post92482See below for Eric's very good comparison of BG vs CNBG.
