GW - based on what I know about the GSF lake I previously mentioned I would leave other types of sunfish out, at least intially for a couple of years, to avoid hybridization. BG have been introduced into the mix on the lake I know, there are now lot's of BG and HBG in there and the GSF numbers have dropped dramticaly in both numbers and size. I do like the tilapia idea, the offspring would provide plenty of small fish for both the LMB and GSF to forage on. The nice thing about GSF is their big mouth and their abilty to eat prey much larger than most sunfish can. They also have a more streamlined body shape that lets the LMB more easily eat them in larger sizes than other sunfish. They way I see it is that the with GSF only in ther mix you should see very little LMB reproduction and the existing LMB should be able to work on GSF up to 7-8". If the timing and stocking numbers work out you could end up with a trophy GSF & trophy LMB pond. If it we me, I would stock the GSF only, then wait a year or two before adding any LMB.