Rio "Atabapo"For what should be a simple search, I’m having trouble, but I did read the Atabopo is bigger than the Orinoco. Probably i misspelled the A one. I do find them equally beautiful.
I find those sorts of things to mostly be exaggerated-- in terms of issues (in a large enough tank). Of course, different species, genera, families, orders, etc. can have variations in body language, social interaction, etc. But no one says "you can't keep cichlids and catfish together because their body language is different." Put them in a tank together and they manage just fine, assuming enough room in a tank and that size, aggression, etc. is compatible.Supposedly altums and scalare have different means of establishing pecking orders, resulting in poor communication and potential aggression between the two, but I never noticed anything of that sort. Doesn't mean it can't happen, though.