I found this guy earlier today inside some Live Rock rubble I got from the LFS. He retracts completely into the rock when bothered. Any ideas on what it could be?
I've always wanted to try a saltwater tank, and my husband finally gave the 'ok' to get one started! It's a little 10gal reef and clownfish tank, but it's doing well so far. I keep getting interesting hitchhikers in the live rock from the LFS.