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cannot say for sure but i would like to put $5 on it it is much less likely to happen in captivity.
the best yoou can do is to keep salinity as constant as humanly possible and dose iodine in tiny daily quantities (8 drops/day/50gallons). plus target feedings may help provide the energy needed to regenerate the arm. JMHO
no gimpy is a suitable name for him seeing as how he was a gimp when you got him...
i hope he heals then you will have a cool story to tell about the little guy.