I'd like to share the experience of breeding a Tetra, so I have selected the Buenos Aires Tetra since I'm currently trying to BAP this species. I've struggled raising the fry with several failed attempts this year already, so I hope to have learned enough to make this attempt finally successful, but let's not keep our fingers crossed. Let's just think optimistically. My method is a pretty general approach that I use on all species of Tetras that I breed.
Parents the night before spawning, right before the slow drip acclimation to the breeding tank's very soft RO water. The female is much larger than the male. This is a 1 gallon container to be used for the drip acclimation.
Here is a video of the parents
Here's the pair in the 5.5G breeding tank after being acclimated. Egg trap to separate the parents from the eggs, java moss & rotala for spawning media.
Here's a better shot of the bottom which is pretty clean.
My morning round of tending to my fish room starts at 6:30AM each day. At this time which was right after turning on the lights of the tanks that I'm about to feed (not this one), I was fortunate enough to witness the first couple of eggs being dropped, but when I came back to check on the tank at 7:30AM after eating breakfast and getting ready for work, I found many eggs on the tank bottom.