It is possible that the clown could have jumped and landed in the skimmer, the overflow, the filter, or outside the tank. Are they the only fish in the tank?
i've checked all the above , and no sign of him and the other fish and inverts are 2 green chromis , yellow wrass , engineer goby , small bannerfish , 2 hermits , 1 sallylightfoot , 3 turbo snails . the other clown seems to be hanging out around that one rock.
120 saltwater, 2 perc clowns,4 green chromis,1 engineer goby,1 yellow wrass,1 blue hippo tang ,3 hermits,3 mexican turbos