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					Originally Posted by  jorjef
					 
				 
				 But not likely there is any realistic chance of a hitch hiker crab taking down a fish. 
			
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Are you kidding?!?!?  
It's best to omit that advice about crabs not taking out fish.  It's horribly wrong!
I had a 20g reef with two crabs in the past.  A hairy crab and a purple red eye crab.
I lost a couple small gobies before I went after them.  
Try jam a screw driver into the hole they are in.  Sometimes you can kill them.  I got one that way, the other was harder and I ended up selling the rock to someone who never cared it was there.