It should work, but the only thing that would have me worried is the Dorado being to aggressive during feeding time and picking fighting with the other fish. I would go with one dorado any more then that would be to much aggression.
Yeah thats what I've been doing to keep the dorado's aggression down is only put shoaling large cichla and bottom dwellers with him....hes not very aggressive at feeding time....just kinda of harasses all the cichla and sometimes the bichirs all the time around the clock except when he's eating/I'm feeding. If you have kept/keep dorado though Lambrakopoulos you should post any information you know on them in my dorado thread in the mosterfish section though btw.