I only see my peppermint shrimp once every 2 or 3 weeks, and only if I come down and look in the tank in the middle of the night. They're extremely good at hiding, and only seem to come out if the entire room (not just the tank) has been dark for awhile. They have kept control of my aiptasia, but they won't eliminate it.
How long did you acclimate them? I was having trouble keeping them, then my LFS told me you need to drip them for at least 45 minutes, preferably 90 minutes, for them to stand any chance of survival. Once successfully aclimated they seem pretty hardy though.
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