Well it was not my intention to breed them...or live bearers either. I bred live bearers in the 70's, but never egg layers. In those days I hatched brine shrimp in gallon jars.
These two are odd. I bought them together, I presume from the same brood, although as I mentioned, they were the only two marbles in a tank with several other black lace. Anyway, when I bought them they were both between the size of a nickle and a quarter. They both have grown, but one is nearly twice the size of the other.
The larger of the two is the greater protector of the eggs. If another fish comes to close, he will turn horizontal and chase it away at great speed. S/He breaks off after the fish is sufficiently out of the area. Fortunately the plant where the eggs are laid is in the right back corner (60g), so they can have their space without as much disruption to the other fish as if, say, it was in the middle of the tank.
I'll just let it all play out and see what happens. I'm not convinced yet the eggs are fertilized and in addition to fanning them with their fins, here and there the angels are doing a little pecking at them so I don't know if they'll make it even if they are fertilized.