please read carefully,
Peppermint shrimp are very interesting to watch, but adding them to a reef tank is, in my opinion not a good idea. Shrimp in the Lysmata family have a well documented history of nipping, eating, or harassing desirable reef invertebrates. When food is scarce (or maybe not) corals and clams become "temporary" favorites to nip, eat, and harass. Recently these shrimp have become popular because they eat Aiptasia. The addition of these shrimp to the reef tank for the purpose of eating Aiptasia is ill advised in my opinion. We as good aquarists cannot expect these shrimp to eat just one type of cnidarian (the Aiptasia) while leaving other cnidarians (corals like the Xeniids) alone. Nature just does not work that way. More importantly, if you have problems with Aiptasia and use this shrimp to eat these nasty anemones, you are not addressing the problem (water flow and/or excess nutrients) which are allowing for the Aiptasia bloom in the first place. Instead, you are treating the symptoms by introducing this borderline reef safe invertebrate. I would recommend this shrimp for a fish only with live rock display, as they are really good cleaners, and can be very active in a non aggressive tank. From a reefer since the mid 80’s, back when they said keeping a reef system was impossible for the average aquarist.
Just thought you reefers should know...