When my crab molts, it leaves a shell that is identical to itself on rock. I first thought that I had a hitchhiker since I knew it wasn't my original crab. Kindof creepy looking. My peppermint shrimp do the same thing.
55 gal. reef. Coralife lunar lights 4 x 65, 120 lbs live rock. Remora skimmer, 3 power heads. 2 tank raise false percula,2 pajama cardinal,hermits, snails, Xenia, leathers, mushrooms, polyp frags, yellow sea cucumber, And last but not least - the miserable mantis.