Crab Hitchhiker ID?

[noirsphynx]

That's a porcelain crab, great find! Harmless filter feeders.

[tlhood]

I thought this guy had died a month ago, but it appears I was wrong. I got home fairly late and my lights were off, and I happened to see this guy out d the corner of my eye. He has doubled in size and I got a view of his other pincer. He doesn't look like the porcelains I have seen. While his one pincer is large, the other is very thin and pointy. I haven't noticed any of my inverts or corals missing or taking damage, however I did lose a goby who was digging under the same rock this guy hides in. The goby was in rough shape when I bought him, may be coincidence. If I manage to get a picture ill post it. He doesn't like light and my camera won't focus on him very well.

[Madreefer]

Put a small chunk of prawn in a tall smooth drinking glass. Place it at an angle near where you suspect he is at night. You'll catch him eventually and can decide if he gets to live in your tank or your sump.