So about the next day after these pictures were taken, I came home and had to remove five of the angels - I officially have a pair. And I must have been really not paying attention for a couple days, because I came home to find a large group of wrigglers on a leaf, didn't even notice eggs prior to that.
Mom and dad with the babies, which they keep moving around the tank.
No secret...proper tank size, feeding, and regular water changes (aka good water quality). My water is also perfect for South Americans, very low pH, GH, and KH, dunno if that helped or not.
Eh, we'll see. I probably will once I clear out the crayfish babies, so I can use that tank as the grow out - since it's the only spare tank I have. I'll leave them with the parents for a little bit though.