The commercial Sea-Monkey aquariums each provided five or more adults in 6 weeks. But, why did all the DIY Sea-Monkeys aquariums fail to grow Sea-Monkeys? I used different diameter jars thinking the aquarium water surface area was critical for Sea-Monkey survival since diffusion of oxygen into the water depends on the surface area.[1] The area is equal to 3.14*r2: where r = d/2. So, the bigger the diameter, the bigger the surface area, the better the oxygen supply. With better oxygen, the more Sea-Monkeys will grow. However, the number of Sea-Monkey hatched was not a function of jar size. No matter what the size of the jar, no Sea-monkeys. Jars #3 and #4 were about the same surface area as the commercial elliptical aquariums. I expected jars #3 and #4 to function just a well as the commercial aquarium. One obvious difference between the commercial control aquarium and the DIY jars was the crushed green glass. The crushed green glass could be a good experimental variable to test.
[1] Mack, Paul. "Dissolved Oxygen and the three S." Sierra Club (2003).