Fry
It shouldn't take more that a few days for them to become free swimming, then the parents will move them to a section of the tank they feel is the safest for the babies. You should start feeding them now, you should try to feed them multiple times per day. There are many liquid fry foods that you can buy, you can also hatch your own brine shrimp for them. Do you feed your Angles frozen food? If not I would, something I found with on of my breeding pares was that they were very reluctant to eat anything that would take them far from there fry, so I fed them blood worms and pre-wet flake food to make sure they were getting proper nutrition.
Oh, just another note. I would use caution when turning off the lights, there are occations that the parents will stress and eat the fry.
Hope this helps some.