I've researched it a bit as my nephew received a kit last Christmas. It doesn't sound too hard to breed them and I considered breeding them to use as feeders. They do have a short life span though as they are truly seasonal creatures. Pretty neat stuff.
I used to have them. pretty neat and easy to keep. I kept some in a 10 gallon with a sand bottom I let the tank fill with algae to eat and i never fed them besides the occasional carrot peal or small guppy fry. Mine got to 2 inches. and lasted about 100 days, thats a little longer than there listed max age. Its easier to harvest eggs in a smaller tank though. I had 2 generations of them but lost the next generation of eggs while moving. you have to dry out the eggs to make them hatch.
I believe the species commonly sold are Triops longicaudatus.
I hope to own Triops Namidicus eventualy
Of the entire crew of them that hatched there is only one left. I have him in a gallon tank with about a litre of water in it. no substrate yet. I've been thinking of buy another kit just to have more.
Just read about them.They sound very cool, related to horseshoe crabs. Mature in just 8 days, wow how hard is it to harvest the eggs and dry them? Would they get along with ghost shrimps?
I can never get them to hatch fully; maybe one or two at most. For being hardy things, they seem to be pretty strict on what kind of water and temperatures they need to hatch and live.