You can, but there's no guarantee the parents will eat the eggs. The female usually will, but if the male is still in the tank he will chase her off and perhaps kill her for threatening his fry. Males usually only eat infertile or fungus infected eggs barring any other circumstances (like stress), though sometimes you just get an egg eater who will finish off an entire spawn.
So in short, yes you can allow the parents to eat the eggs, but it's not exactly guaranteed that you will end up with a smaller spawn by allowing that. They may not eat the eggs, or they may eat every single one. You can't exactly lean over and whisper into the male's ear "Hey, bon appetit... but don't go nuts, k?"