I picked up a sweet 3lb piece of live rock from my LFS guy. It has very very tiny mushroom coral growing on it along with white sponge. As I was situating the other pieces of rock too make sure it was stable, my fire shrimp decided he wanted to give me a pedicure... I guess! hahaha It was running up and down my arm as I was playing with the rocks and picking at my skin. I guess something was yummy on my finger because it liked it there.