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The black lapets on the dorsal fin rule out Guianacara geayi and G. sphenozona.

The fact there is a bar rules out G. oelemariensis, and the fact it's not a wide bar rules out G. owroewefi.

That leaves either G. stergosi (aka Rio Caroni) or G. cuyunii. If the bar fades as they get older or if a spot shows on their flank when stressed, it's the G. stergosi. Which is the more likely of the two, it's the most common Guianacara in the hobby.
 

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Almost all the Guianacara are sold as geayi, but it is rarely found in the hobby. Yours are 100% not geayi though ... not only does it have the black lappets on the dorsal, but it has a thin bar instead of wide. Double disqualification. :thumb:

Kind of like how a lot of Geophagus are sold as surinamensis but practically zero of them actually are. It usually stems when all the various species were just throught to be a single species with regional varients, before being split up into differant ones.
 
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