pissed at my goby

I have a yellow watchman goby who has been snatching up my hermit crabs and taking them to his little cave. <img src="graemlins//yell.gif" border="0" alt="[yell]" /> I have been finding empty shells and I was wondering if he has been sucking the crabs out of there or if he is just a little pack rat.
 
Well how does he get the little suckers out of there and why doesn't he just get filled up on the frozen krill I put in there every day. <img src="graemlins//confused2.gif" border="0" alt="[confused2]" />
 
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