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tank over 1.5 yaers old had 2 cleaner shrimp ,no fish addons in a few months.have a few corals ,duncan,frogspawn ,zoas ,hammer candy canes .
Fish yellow tang,clarki,scotter blemys,sailfin tang.and a black urchin ..
duncan is only new addition . I think culprit is either duncan or urchin ??duncan was closed ttight for 3 days! No other problems in tank.
it could of have just molted and hid itself. those things can hide pretty well after a molt session. lol give it a couple of days, it could turn up again.
They do better in pairs and are more adventurous when in pairs. Now that the one is a single it might not come out as much. Give it time though, as monroereefer said it might have just been a molt and they take a little time for their shells to harden and then venture back out.