This is a cut-and-paste from a message that I posted nearly a year ago for another FishBox member whose angels had recently spawned, and was asking 'Now what?'...
Now comes the hard part. Angelfish fry are more sensitive than just about any other cichlid- possibly with the exception of discus- and fry mortality will be high, even under the best of circumstances. There are two main issues. (1) Diet. The little angels are tiny, too small to eat newly hatched brine shrimp, so infusoria is the food of choice early on. Culturing infusoria is easy (search online), but it takes some time. Start now. Microworms are the next option; you can buy seed cultures on eBay. (2) Water chemistry. Little angels are
extremely sensitive to dissolved metabolites, more so than just about any other freshwater fishes. The optimal setup is a bare tank- no substrate, no decorations,
nothing- and
at least 50% water changes
every day. When I was raising angels I did 50% water changes two or three times
every day. It sounds radical, but experience has shown that's what works best.
For the best yield of viable fry, removing the eggs from the parents early on and raising the fry in bare, pristine tanks is the way to go. But there is nothing quite like watching an angelfish pair raise their fry, and seeing the little angels sprout their wings is magical.
Don't expect to succeed the first time around. But in all my years of fish keeping, there is nothing quite like raising your own angels. Good luck.
This was my favourite pair of F1 angels, raised from a tank-raised black male and a wild-caught Peruvian female. Black progeny reappeared in the next generation, as expected, but they were as aggressive as wild-caught fishes, which was not expected.