One of my 9 Black neon tetras looks VERY bloated and is about 2x the size of any others. Her stomach has a triangular shape to it. Is she pregnant? And if she is, what should i do with her/ her brood?
Black Neons are egglayers, not livebearers, thus she is not pregnant. It is the normal state for female egglayers to have rounder deeper bellies then males.
In a community tank, the fish will eat the eggs, and any fry that may emerge from hidden eggs. To breed them, you'll need a seperate breeding tank.