I would still feed the algea tabs, these crayfish need more plant matter then meat, and most flakes are meat based. I would put the algea tabs and a few flakes. Maybe crush the algea tab up a bit so there are lots of pieces for the babies. How many babies do you think you have? Oh, and they usually don't overfeed themselves, but any leftover food would foul the water. I feed them a lot, but the corydoras eat the leftovers. And anyway, these guys are scavengers, so they are used to not always stuffing themselves