Bleeding heart tetra? Can't tell if its hyphessobrycon erythrostigma or socolofi though. Maybe even a flameback bleeding heart? There is a sllight red patch on its back.
Given the nature of this thread, it's only fair that anyone can post. It's not a journal or the likes that a single person provides the bulk of the information..
I can say for certain it is a tetra from south america and the common name is bleeding heart tetra but thats all I know I’m not really someone to know a lot about characins.