This hasn't gone well at all...
While trying to catch the mother of the eggs, I noticed that the other female (false) viejita has an injury. The strange thing is that the one with the eggs is a recent addition, the other one that is now injured and in the hospital tank was getting along very well with the male until very recently and I expected her to spawn with the male before the new one.
Also, there are golden wonder killifish in the tank. There has been some aggression between the killifish females but I havent seen them bother the apistos.
So I'm not sure who hurt the female viejita. There are several scales missing from her back and she is laying low and hiding in the hospital tank. Could it have been the male? Perhaps everything changed when the new smaller female spawned and he became aggressive.
Also, the eggs are gone now. Not sure if they hatched and I let them loose to become snacks for the killies. Or whether the mother ate them due to the stress of me tearing up the tank and moving her coconut hut around. It's all very sad and a learning experience but I hate for a fish to get injured.