his pom pom wont 'grow back' unfortunatly, they are actually small anenomies that the crab hangs on to, but the crab dosent treat them very well (dragges them around and never feeds them) so in the wild they switch them out for new ones occasionaly. he may have just dropped it or it may have died, and i dont think that you can buy new ones, although in a tank with no predators they will be fine without them.
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