unfertilized eggs

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I'd vacuum the eggs after 24 hours. If they haven't fungused by then, the membranes will begin breaking down and the yolks, albumen, and (in some species) oils will be released into the tank. These materials will cause a major bacterial bloom in the tank.
 
But, I would leave them in overnight, the BN might decide to have a treat, that will be good for it.
 
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