After decaping them, can you feed the eggs or do you get better results if you hatch them out first? I was thinking the eggs would be more nutritious but the movement of the hatched shrimp would attract more takers.
The "moving target" thing is crucial with Angels, I can tell you that. I would imagine it applies to the newly free-swimming fry of a long list of species. If I remember right, Angelfish USA has a pretty extensive write-up on the nutritional aspects of decaps.