I don't think that picture in the middle is a real GT. There is a recent thread talks about the difference between GT variant and a real GT. The one in the middle comes from Ecuador while the real GT comes from Peru.
Im in ecuador right now visiting my wife´s family and was in peru as recently as this morning. In a plaza here in guayaquil, they have a ton of iguanas as well as a shallow pool that must have had two hundred large cichlids in it. I could not determine their species, but they looked something like GT´s. Would they be able to live together like that?
yep that shows that gt can live in groups cause in rivers they live in big groups (you may be asking how i know this but i am from GUAYAQUIL-ECUADOR) im in jersey city for now.... my GT is in ecuador waiting for my return...