Those bluegill in the pic are hybrids. Obviously raised to be bigger and as 'trophy fish'. They are in any body of water that are usually stocked by a private owner. Those pics come from an article written about a fishing club. I have kept a bluegill, a pumpkinseed, and a black crappie at different times in their own 55. Neither liked plants that grew past the halfway mark of the tank and would tear them up when they grew bigger. As far as temperment, I have had NONE that allowed smaller fish to live in the tank with them, with crappie being the most aggressive. Maybe if smaller fish are introduced at the same time, they might not get killed....might not. I will say that the crappie was the coolest to watch when it stalked prey. It would change colors from half and half silver/black to all black. I never had a gill jump out of the tank but the crappie did and subsequently died. Might wanna think about a lid. Good luck.