As a rule of thumb on breeding Tetras, it’s very hard. I can get mine to breed but it tacks a lot of work.
I keep them in a planted tank till I’m ready for egg laying. DKH 5 DGH 7 Temp 78* Then there moved to a 20 long bare bottom tank with a piece fish net type stuff (holes slightly larger) about 1 inch off the bottom. Then I water change 50% at 70*. Watch fish closely for fish to lay eggs. After fish lay eggs male will swim around the eggs. Then normally all the fish will start eating eggs.
Fish will need to eat very healthy and feed lots of different foods.
Would try with groups of 5 or more.
Some times you can get them to breed up to 3 times a month.
The eggs will fester with fungus quickly. I use small doses of Anti-Fungus and lots of water changes.