Go in with a flashlight a couple hours after lights out. Use some kind of rod/poker to flush it out of the rockwork and quickly net it before it figures out what is going on. Might take a couple days but this is how I have removed larger fish from reef tanks before. You might have to move a rock or two depending on your setup. If there is space to put in an eggcrate divider that helps too (to section off part(s) of the tank).
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