True, dorados can be tamed by witnessing fish that are much larger than them and who have calm temperaments. There's been a few reports by members here who have had success like that.
God I want a Dorado. I'm just not willing to risk Max.
I love cichlids but if you don't realize what an impressive tank that is you have rocks for brains. For what it's worth, the C. piquiti in that tank is a SA cichlid.