Are the eggs gone because they have hatched? Otherwise, I would say to remove all but the Mom fish from that tank, once you see eggs. My sisters huge angelfish lays eggs a few times a year, even though there's no male around. And the others in her aquarium eat the eggs as soon as the Angel fish moves away, even for a few seconds. Maybe that's what's going on? Also want to know, how you know for sure those are male/female? Have been told by many owners of these, that it's hard to tell even when they are a few years old.