Now I figure....

My nigripinnis are still alive. Last time I hatched the gardneri I noticed that some fry looked like belly sliders but over time they developed OK. I am doing the same with the nigripinnis, just levaing them develop. I saw that they are usually in the bottom of the raising tray and maybe some are not really belly sliders. Even the larger fry when they see me they start swimming at the bottom but yesterday I saw that I have more than 5 or 6 normal fry.
My male gardneri never wants to cooperate and especially now he is so frightened because I separated him from his females to increase the chance of getting eggs. I really like the color of your gardneri, mine is usually paler blue and the red marks are not that intense, not sure if I am doing something wrong, have a pH of 6.8, temp of 24-25? C, small power filter (Azoo mignon filter) and no light other than what enters through the window (not direct exposure). I feed them tubifex, grindal worms, sometimes brine shrimp, micro pellets and high protein pellets. If you have any tips I will really appreciate it.
The male alexandri was about 4 cm, how big are your nigripinnis? I noticed that some fry are darker than other but not sure if it's my imagination.
Regards,
Tony