It's a great feeling isn't it. My corys quite often spawn after a water change but I presumed that all the eggs got eaten as I am not actively trying to breed so just left the eggs. Put the light on yesterday and fed them and lo and behold a little baby peppered cory swimming happily around the bottom looking for morsels. I am chuffed to bits especially as I did nothing special to raise him/her. It must have just survived by hiding away when tiny and managing to feed on the scraps of food left over.