I'm suprised even 1 of the fry survived, tetras in general will eat anything that will fit in their mouth, as far as I know bettas are the same, even platties are known to eat their own fry some times. The odds of livebearer fry surviving in a community tank are pretty low.
Supposedly neons are easy to breed, they do it constantly and most people don't even notice, the problem is they eat each other's eggs about as fast as they are laid in an aquarium, any fry that are hatched are eaten just as quickly as the eggs. Probably what you saw was a corydora egg, they are maybe 1mm in diameter, tetra eggs would be smaller.
A bunch of java moss will increase the odds of your fry surviving, a couple females to each male will keep the harassment to a minimum.
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