11-04-2012, 05:57 PM
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Angelfish frequently fail in their first several attempts at spawning. Wild fish never do this, unless they are under stress, but commercially-raised angels do. Once they settle into this, they should be successful. And as mentioned, they will spawn repeatedly.
Stress will also cause them to eat the eggs, or the fry. This can occur from many sources, but primarily from other fish in the tank. And of course nocturnal fish in the tank, like any of the catfish, will frequently get the eggs or the fry at night when the angels are unable to adequately defend them.
Assuming you have a mated pair, eventually they will raise fry, and then you will have to provide the fry with live foods like brine shrimp or one of the commercial fry preparations.