I saw the exact same thing a few days ago, the hermit crab was sitting at the top of my birdsnest where new growth is forming. I took the crab off and put it on the rock near the birdsnest, and it had the gall to crawl all the way back to the top of the coral. After that, he promptly took a flight to the other side of the tank and he hasn't found his way back so far.
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