Here is Cichlasoma dimerus Bella UnionTangled up in Cichlids has some pulchers I have my eye on, the Andinoacara pulcher , Cichlasoma dimerus 'Arroyo Chelsea' F1 , Cichlasoma dimerus 'Rio Cuaro' F1 , and Cichasoma dimerus 'Bella Union' F2 (no picture shown).
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Bella Union is the river border of Uruguay Argentina border in that area, and is a bit temperate, as opposed to being tropical, so in nature this species gets a bit of a winter cool down, and that helps it remain healthy.
I kept it with other Uruguayan species without a heater, where the tanks water temps dropped into the 60sF
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They also did well and spawned, in my pond in Milwaukee May thru Sept, where temps could fall even lower
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Beautiful fish, love that gold! All of my tanks are unheated save one, the 225 which is at about 75-76 degrees. Would these still need a cool down at say 75?