FWIW, my broodstock love the nights when my Lystmata release little babies into the tanks...it's usually a FEAST (especially the cardinals, which have NO problem feeding nocturnally)
Kirkendoll's book tells you all you need to know when it comes to peppermint shrimp, and from what I've seen in mine they're probably REALLY easy to raise (I have one larvae that's grown up in my Greenbanded Goby larval tank...it was an accidental hitchhiker that survived when collecting the goby larvae).
Matt