Sorry guys, the cardinal tetra breeding was unsuccessful.
The following is how I did it after the previous video.
I had bred them two times before this. And in both cases, they spawned within three days.
So on day 4, I had two options.
1, Put the fish back in the community tank, condition them for 1-2 more weeks and try for the second time.
2, Leave them in the breeding tank until day 10, when I would make a water change, hoping to trigger their spawning.
I chose the second option.
On the fourth evening, I decided to feed them some quality life food-blood worms.
But it turned out to be a terrible idea, they didn't touch the blood worms, and all the blood worms just slipped through the mesh.
On the fifth day morning, I saw all the blood worms wriggling on the bottom. So on the same day evening, I switched to daphnia.
I put a small LED light near the breeding tank and left the LED light on through the night, hoping the fish would eat them when I
wasn't there.
From day 6 to day 9, I did nothing except do an egg check every noon.
Expectedly and frustratingly, they didn't spawn, which led me to the tenth evening.
I would do the water change on them.
But just when I was about to do it, I was stunned to find one female fish floating upside down. I had to move them all back. This female tetra eventually died after three days of lying there.

The reasons why I failed this time?
1, I was overconfident after previous successful attempts. The fish weren't well-conditioned. There was even one female fish with a very flat belly.
2, I should have put them back on day three and tried for the next time.
3, The fish were under constant stress in the breeding tank. They shouldn't be in that environment for a long time.
I may have had a few successful cases where they bred after 10-plus days when I did a water change on them. But that is too risky. I should not do it in the future.
I hope you guys can learn from my bad experience.

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