OK, I've pinged the supplier of the HBGs to see if anyone else has reported similar issues, but I can also explore the option that the GSF came in during the flood. If so, it sounds like my culling just got a lot easier, just start keeping the GSF for the dinner table and throw back the HBGs, assuming I can tell them apart! If I want to go down the predator path, what are some suggestions? LMB? And you're suggesting these to eat the spawn of the GSF to keep them from taking over? My son's on the local High School Fishing Team, so I have access to CC or LMB or Crappie, etc. I also reached out to the pond owner downstream to see if he'll engage with me to see what species are in his pond. Thanks as always guys. Keep the suggestions coming.