I had the same issue last week with my albino cories. They have spawned twice in a week and I got them off the glass as best as I could using a razor blade but dropped a few. It was hard so I used my finger in the end and placed them inside a breeder net and aimed the filter flow at them. I have nine, one week old baby cories now and I'm feeding them 4 times a day on liquifry and baby fish food powder