For nutritional reasons a hatchery would be needed to be started up a day before every feeding time. As brine shrimp loose there nutritional value very quickly. And remember, they are small and are hard to be seen by Fish. I usually just put the shrimp in one area of the tank and let my fish swim through the cloud of shrimp, since they have trouble seeing them. Only my fish that are downwards of 1 inch don't have trouble eating them IME