Is my Buenas Aires tetra about to spawn?

[AquaDad]

Hi there. I have a pair of BA tetras that I had to separate from my community tank because they started biting other fish’s fins and killed a couple of them. I’m not super familiar with them (I inherited them from someone else), so I don’t know if they’re male or female yet.

Recently the bigger BA is fatter than usual, with a brownish bulge right in front of its anal fin. I should mention that they almost completely stopped eating when I moved them to the emergency tank, which is also soaking some newer driftwood (hence the green colour right now). So they’ve been a little bit neglected, and it wouldn’t surprise me if it’s some sort of disease. But I wanted some outside opinions.

Here are a few photos - let me know what you think...

 

[V227]

If the Buenos Aires Tetras are eating and otherwise acting normally then it's likely the swollen belly is due to eggs. If the Tetras have locked up & refuse to eat then you might be dealing with an intestinal blockage or a bacterial infection.