You don't need to worry about neon tetras breeding and over populating the tank as it is very unlikely that the eggs will survive long enough to hatch as they will all be eaten. The eggs and fry are light sensitive so unless you keep the tank in the dark, the eggs are unlikely to hatch if they do survive being eaten.
In order to breed egg laying fish, they are usually put in separate tank and removed as soon as the eggs are laid.
In order to breed egg laying fish, they are usually put in separate tank and removed as soon as the eggs are laid.