I wish I knew. I can tell you that in a 10 gallon and a 20 gallon sized tank, I was only able to house a small number of mysis. I tried culturing as many as I could to feed seahorses. In the tanks mentioned previously, it seemed that I could only expect to have about 10-20 adult mysis at any given time (and that was the best of times).
I wanted to look into culturing them again but the links I found explained a process that I could not engage in at this time. I'll post the links as I have them saved somewhere.
A good place to search or inquire for information is
http://www.mblaquaculture.com/. Paul Sachs (
http://www.aquaculturestore.com/info/index.html) may also be very helfpul. I'm not sure if he cultures his own though.