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As long as you can keep their bellies visibly full or at least close to full they should be good to go, but you will probably lose a few still, it's just the way it goes.
micro worms are great to feed them and if you put to much in the tank they will live 24 hours in fresh water , so you can cut down the number of times you feed them and give them a little more if you can feed them 5 times a day