I tried the oak leaves packed in tight in a ten gallon like a few of you suggested I try. I seen just now Corydoras axelrodi juvies coming out to feed. Good size on these guys already after only setting this up 5 weeks ago. I tried many ways with this species and nothing worked good as this. This made breeding this c class cory easy as an endlers or guppy . Don't have do anything but feed and water change with tap water. I also have plenty of shultzei type black this way. This is the only way I'm going to try and breed cories from now on. Thanks guys .