I havent had crabs for a couple years, but successfully had them for 17 plus before this. My oldest crab lived to be 16 years old, and he was a monster before we go him, lol! My son got three crabs for his birthday from a friend. I am just glad we have the husbandry experience we do, because thats not ok! Anywho, the three smalls (size of a silver dollar) were in tough shape. Set up a home and that night two of them changed shells immediately and probably each ate 1/2 teaspoon or food. However, the crab that needed to change the most....wont. Stubborn thing! This crab has a shell that is BROKEN and chipped and is about a size 2 bikini when the owner is clearly a plus sized gal..... We have many, many, many shells to chose from. Both of the others chose green turbos, leaving murex shells in the trash. But this little girl wont!!! Wouldnt care much but the shell is clearly degrading and holds no moisture. Any tips to get her to change? Ive tried them all, from boiling in salt water to puting her in a shell mall. thanks!