Ok so i dont know anywhere to get gg so im not to interested in them anyways. I realize hbg will be put and take im good with that. From my experiences in my pond i have had bg in since 2009 and have not cleaned one since. My hybrids been in last two springs and are as big as my pure bg. My fish biologist said karmex messed my inverterbrates up but i have been feeding all along ang my hbg are surpassing my bg. So i am thinking starting with hbg. I have searched every photo on them and they all look different in ways. More photos of big hbg would help me out. I just dont like the looks of mine as they look like gsf alot. My grandpa always said they were bad and everyone i caught i removed. So now i got mixed emotions about stocking them. But maybe its where i got them from.