Congrats on the spawn! Surprises are well funny......
To be honest, the breeder net didn't work for angels. My parent angel usually suck the babies out of the net, but you could try it. It would be helpful to get a gentle air stream with an airstone beside the float in the net to move the water around the eggs. Normally the parents would fan the eggs by flapping their fins and wiggling their bodies over the eggs to aerate them. Aerating prevents fungus. The air stream mimics the parental care. If your tank temp is around 80°f, the eggs would 'hatch' in a couple days and go free swimming at about the 5 or 6 mark. This is when they first look to hunt food. Their natural instinct is to go for moving prey, so live foods are the best.
But I've had some success with dry and frozen foods, so it's not to say you can't do this. When you go to the store, look for golden pearls. A freshly hatched brine shrimp is approx 400 microns. I haven't tried them yet, but they are supposed to be a good nutritional runner up. Also frozen baby brine shrimp was always good with the fry.
I hatched my first batch of angels in a pickle jar with an airstone! I didn't have any special food, just ground up adult food. If you are serious about raising angels, you'll probably set a more solid plan for a 'nursery tank' and a 'grow out tank'. Also how you will feed them. Baby brine shrimp eggs were too expensive for me as a casual beeeder