I wouldn't remove an interesting creature simply because you think it might multiply out of control. It may not. Wait and see what it does and do something later.
...but my opinions are generally not mainstream.
A 1/2" mantis might be able to kill a blue leg hermit. No doubt it would want to try. My opinion (again, not mainstream) is that blue leg hermits only cost $1.50, but try to find another mantis...I think the mantis is more interesting to keep.
What big green crab? A 3" mantis?
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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