Nice Question!!!!
Sometime this happens with with angelfish but very rarely.
It is most likely the egg might have been unfertalize by the male due to interuptions from other fish.
One of the reasons the female or females might lay eggs on their own is if there is only one or two angel fish to begin with, if you have three or more it is most likely that you have a pair.
If the eggs all turn white in the same day or with in several hours before the fungus develops then the eggs are unfertalized or the water is not suitable for life.
Take a close look at the way angels are laying egg. Usually the female makes a pass laying the eggs and the male follow her fertalizing the eggs and and they do this for some time. The female has a thicker gomates and it is more rounded at the tip almost looks like it is turning out, while the male is thininner and longer.
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