We had them as kids, my sisters room was a sea-monkey factory! she had good luck with a big black one, she never had a interest in keeping fish but she read and read about setting up a tank for them.

 one day I got the idea to feed it a small baby guppy from reading that it was good for them as sea monkeys (brine shrimp)  is sort of a empty food score for the large sea horses.  and sea monkeys are hard to fill up a big sea horse on alone...  it choked to death on it, very odd, we called a vet and everything.. vets thought we where nuts to call about a pet sea horse choking...... it sucked that guppy  down happily then  it went to the bottom and had trouble breathing.... and tried to spit it out... jerked around it was horrible. died that night..

We did not have captive bred ones I don't think back then..

I don't think my sister has ever forgave me.