if the mother is a loser lol and not taking care of them right like some females do. Than you might want to consider more drastic measures. Try setting up a separate tank with the same water, use a flower pot base for the spawning ground, and remove the eggs still covered in water once they are fertilized to the new tank. Set up a filter right in front of the eggs so the water drop from the filter will push a constant flow over the eggs. This will simulate the mother's fanning action, and I will tell you from personal experience this method works very well when done correctly. Good luck hope it works out for you!