you'll have a hard time growing them out in a community setting unless you're planning on putting them in a dedicated tank to rear them.
if you're in a pinch, there are some commercially prepared fry foods that you can get at the lfs or you can hatch your own brine shrimp naupili
if you're in a pinch, there are some commercially prepared fry foods that you can get at the lfs or you can hatch your own brine shrimp naupili