A couple of days after buying 2 Hermit crabs i noticed what looked like the larger one attacking the smaller one.
After about an hour it looked like the larger crab had killed the smaller one and completely ripped him out of its shell.
Later on it turned out that the small crab had just molted and the other one was probably trying to eat the molt as it is high in calcium and they are supposed to eat it anyway. Now the smaller crab i hiding apparently waiting for his new skin/shell to harden. Then he should eat the left overs of his molt and be fine.
As the Hermit crabs grow they do out grow their shells they carry around on their backs. You can buy replacement shells on ebay. it a good idea to have a couple scattered around in the tank for when they need to change. So ive been down the beach and picked up a few.
Reef Tank 