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No they do not change sex.

What usually happens is the dominant female who isnt paired off, will act as if she is ready to lay eggs, sometimes even laying them, the next female in line will then act as a male but will NOT change sex and be able to fertilize the eggs.

They will change their coloration to prevent attacks from other species of fish and to fool each other as well.

Getting them all the same time, might mean you had 2 males but only the dominant one was showing and behaving like a male, now that the "only" male is gone, the sub-dominant male might be mature enough to breed.

They can be confusing at times as they can change over coloration quick.
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