As Silver Nicely Stated
, You shouldn't dig up crabs, If they were molting, You should leave them alone, When they are stressed, They tend to drop Bp's and Limbs, It's not TOTALY bad but, When they go back down, Dont dig them up, After a Successful Molt
, They will grow back thier Lost Limbs. Also try to put the limbs next to them before or after the molt, As they eat this for Vitamins C and Calcium.
Hope I helped!
Chase (Lukems)