09-22-2010, 06:43 PM
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There are two possible scenarios here.
One: you have a pair, and it was just immaturity, a common cause of it, that made the black one eat the eggs. This pair will have fertilized eggs, and they should be a pinkish color if they are fertilized. If they have not been fertilized, they will turn white and die.
Two: You have two females. Sometimes, in a tank with only female angelfish, one will take the position the male normally would and touch the eggs with its papilla. These eggs will obviously not be fertilized and die. While the angelfish may guard the eggs, if they have been fertilized they will live, and if they have not they will die.