10g tanks are popular for breeding live bearing species as well as egg in my experiences managing a local pet store. I've never heard of anyone being successful in that particular breed. I assume you mean the blue and red neons (Paracheirodon Simulans) and not cardinals, black neons, headlight tailight or orange.
I set up a tank, that I still have up and running, for my headboard that was going to be a completely planted tank with smaller fish. The tank ended up being planted with a large piece of bog wood, 88 neons of different species and a large blood parrot. I've had it up for about 3 years now, the neons themselves have been breeding for about 2 and the parrot tripled in size to about 6".
I didn't do anything special just let them do their thing and kept the water nice. I'm pretty sure there is a section in Dr. Axelrod's Atlas of freshwater aquarium fishes that was dedicated to this subject.
