Its eyes are red because it is the spawn of Satan. He's a very bad crab. They can get pretty big too. I had one hitchhike that was about 1.5" wide.

Hey Finaddict,
How did you catch your crab? I may have something similar. He runs into his hole in a piece of LR I have every time I try to get him.

Definitely evil. I had one, bigger then a toonie and such a pain. He met his end with a pump impeller...

I kind of like the way he looks i heard that spreading your live rock out before introducing it to your tank and letting it sit for a small while (on a tarp) will get these nasty critters to expose themselves making it easy to get rid of most of them just my 2 cents:

For safety reasons, I usually smash the hell out of whatever crabs I find.

They're not THAT important in terms of having an "authentic" reef tank.

i was removing my rock and noticed him..

removed him by- /stabbing.with really long tweezers.. then i threw him out side...it was-30's last week... \\no more nasties