They may pair off as juveniles but usually at sexual maturity which is 8-12mths of age.
I have proven this myself with pic included
Different angels can breed together, that's how we get such variety.
I'm playing the waiting game with 5 juveniles myself. I feed them 3 times a day. High quality flake and blood worm every second day with water changes every 2nd day. They grow fastest that way I've found for me.
Best of luck! Ask anymore questions and I'll try answer them best I can