midas,trimac,texas cichlid,and syns are most common, honestly now days very few pure anythings are going into the mix,now days new strains are coming from mixing the older strains,the disirable head and body structure,are not going to be found in nature,yes some of the syns have it,but so much of the work has already been done to get the shorter bodied big head fish, so there is no need to cross back to pure fish