Well i read that baby brine shrimp dont start looking for food 2-3 days after they are born. That is when they first open their mouths and are very vulnerable to disease. So many die durring that time.
I've seen the "big ones" at my LFS, but they have this custom made hatchery. One that I could not find anywhere? I made my own, but it may be too small. I think I will design a larger one.