First question a refugium will help grow copepods,since there is nothing feeding on them. Second To hatch just takes salty water with constant air.Like a bucket with saltwater and an air pump.If you hoping to use this to feed a manderine,they will not always eat brine shrimp.Your tank needs to stable and fortified with there natural diet of copepods.I like them to,but have stayed away do to fact they would most likely strave in my tank.