How do you get angels fish to survive and breed?

I have a solitary female angel fish and I'd like to add a partner or several more. I have a community tank of gouramis, plecos, clown loach,black widow tetra, brown ghost knife fish, mollies and platies. They all get along great in my 80 gallon tank. Her partner died a while back. I've tried to add young ones and they all die. What are the tricks to keeping angel babies and raising them up? Would it be good to add 3 or 4 and let them pick partners? I have live plants, caves and a fluval canister filter system.