2nd try was successful this week, on the oldest, ugliest leaf. The last clutch on a clean leaf all got fungus.
Moved as many as I could to a breader box with the slats lined with floss bcs they all swim through. The parents collected the scattered ones later, back on the leaf. We'll see how each half does, and if they accidently eat the ones they are caring for, I still have the ones in the box.