Regarding trapping the mantis, it's possible that if you've already had your trap in for a few nights that the mantis will not go for it at all. Mantis are very intelligent, if they know something isn't safe then they won't go near it. This could be the problem your having with your trap, which renders it practically useless. If you can find the whole in which the mantis lives, then it is easy enough to remove then piece of live rock and once it out there are many options for destroying the mantis. You can put the rock in boiling water/soda water and this generally does the trick however sometimes they can be tricky buggers to remove.
Otherwise try some different types of traps, or try to coax the mantis out with some shrimp on a fishing line then catch him with a net.
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