No idea about the geo. Red Severum is a beautiful fish that is peaceful but also won't take any crap. You wouldn't be disappointed!
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What do you mean by selection similar temperaments between the species? Can you provide an example?Heckelii threadfins are more acara-like than geo-like. Both heckelii and sevs reach 10-12" and are peaceful. Conspecifics are higher with the heckelii, but not terrible. A normal JD will likely run the tank regardless of which species you choose. Combine that with the similar temperament between both species and you end up with a situation where you can just choose whichever one you like best.
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