They grow pretty quickly. Feed them with baker's yeast that you can buy at your local supermarket. Dissolve about a pinch in lukewarm water (tap), then pour it in the hatchery. The water will become turbid but do not worry, in a day or so, it will clear up...the nauplii had consumed the yeast! Feed as soon as water clears. Make sure you maitain the temp at around 82 degrees, and briskly aerated water. In about a week, they will be about the size of a sesame seed. When you're ready to feed them to your fishies you can enrich them with zoe. Good luck