Ive had a look on you tube my self and they said move them aswell and it take between 3-5 days for them to hackedFishGirl38 said:Well, I don't have a for sure answer, but for most fish who lay eggs. The eggs after laying should have constant water flowing over and between them. I've had convicts breed like mad. Convicts protect their eggs, I don't think corydora dooo, but I'm sure the same water flow rule applies. My female convicts will stay by their nests and 'fan' the eggs with their fins. They'll 'swim' in place to create a slight current over the eggs every now and again. They do this to keep the eggs oxygenated, as well as prevent fungas from growing on them. I'd say the problem would be that they're not in a tumbler, or don't have enough water flowing by them.
Look up an egg rocker, or an egg tumbler. I've found a youtube video done by a youtuber named Jadren Aquatics that talks about hatching corydora eggs. Hes talking about how he used to move them into another container like you've done here but didn't have much success with. (I'd post the link here for you to follow but it's against forum policy).