I have several brine shrimp questions...?

What is the difference between "Sea Monkeys" and just plain brine shrimp? Is feeding them yeast okay? If so how much? I bought "fine sea salt" from HEB and used 1/2 cup per gallon to make "saltwater" for my brine shrimp and sea monkeys, is that okay? What is the easiest way to remove the empty brine shrimp eggs from the surface? They are currently in a 1/2 gallon container (about 150 shrimp), how often would I have to do 50% water changes to grow them to adulthood? What is the maximum safe temperature for them? Are there any fish that I should NOT feed them to? How long do they live? How often do I feed them?