I had a gaggle of 6 peppermint shrimp in my fuge for the express purpose of having them reproduce to feed my mandarin. They are, admittedly, hard to raise in a normal reef tank, and mostly end up as food, as already mentioned. I had purchased the book featured in the above media review link- it outlines how to set-up a rearing system and breed them. Unless you are ready to set-up the new system(about twice as complex as raising brine, but doable) I wouldn't bother getting the book. I fed phytoplankton and pulverized flake to the babies(in the fuge) to get them to grow into mandarin edible size, as prescribed in the book. I never saw any more than half an inch in size. My Mandarin was fat and happy though! :wink: