Time to get the crab out

So when I first started in saltwater 5 years ago or so, I bought LR and eventually I found a tiny hitchhiker crab. Everyday I'd think to myself, "I should get him out." Well, 5 years later that crab has grown, and become aggressive. It's not the snails and hermit crabs that he's eaten that concerns me. It's the fact that he's been trying to attack ME that makes me think it's time now to find this 'crabby' guy a new home. I can't post pics because I'm on mobile, but his big claw is easily an inch long...so he's not to be trifled with.

So, does anyone have suggestions of how to catch a crab with a body the size of a golf ball?