It's said that they do not get fat lips in tank setting. It's thought to be due to diet... snail diet not being given.zoyvig said:Red Devils are Amphilophus labiatus found in Lake Nicaraqua, Nicaragua; whereas Midas are Amphilophus citrinelum from many areas of Central America.
Red Devils were introduced into the US in the early 1960's and the Midas in the early 1970's. It is very hard to find pure specimens of either species at your LFS.
I personally think there are hybrids in the wild. I have a monster male RD (Doctor Death) that looks like he is 99% Midas, even though his parents were large-lipped Red Devils. (Both Wild)