Your live rock probably ate them. When they go to die they usually go right underneath rocks and burry in the sand, or right inside holes of the rock.
I bought a huge lot of dried live rock once, and found a 4" dried up Blue Tang in one of the pieces. I Pm'd the seller and he said that he never even had a blue tang... so who knows how long it had been in there.
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They call it addiction for a reason...
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