What is this nocturnal hitchhiker?

Savannah

Reefing newb
Today I got a stool and was really looking at my tank and I found this guy!
IMG_20110530_100532.jpg


It is about one inch long and only comes out at night. During the day lighting it is all closed up and I would have never noticed it! Do any of you guys know what it is.... and is it good or bad?

Thank you,
Savannah
 
Interesting. No need to feed them, they will grow and reproduce like mad by themselves. I have tons of them, my CopperBand loves eatin them too.
 
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