if you still want to breed
neon tetra i have heard that they ussual only breed in really soft water you can get soft water by boiling water and you can collect rain water from outside. i dont have neon tetra so i dont know if it is hard to breed them but i do have five black skirt tetra and i have tried to breed them 2 times with no sucsess and from my piont of view it is hard but they looked like they were spawning but they just never layed eggs maybe it was because i had no females because i cant tell the difference from the two genders in black skirt tetra