I recently acquired quite a few corydoras pygmaeus from my LFS and was looking into breeding them. Do they require very specific water parameters? My tap water is ph ~7.4
I use these
Possible all but 2 (my oldest surviving members of my first attempt at pygmy) are too young yet, good point.I'd drop the temp to about 72/73, keep species only and feed a varied diet.
The thing with corys are they are pretty good at finding their eggs. So you need to learn to recognize spawning behavior.
I need to scan my cory tank about 3 times a day, as I am never sure when they will be busy doing the tango, and being 2 hours late can mean only finding dots on the glass. Despite cover I have only ever found one baby that made it to quite large size in the tank. So, I harvest all eggs and dump them in the same breeding net with the fry. I couldn't possibly feed the parents more.
The little pygmies should spawn about once every 3 weeks to a month, once they are adult. Unless wild harvested anything you get from the LFS will likely still be juvenile, as breeders don't grow fish to adult size.