Use a nail, a pair of scissors, or something sharp and skewer it. Humanely and Kill don't go together too well...and the methods described above are very close to the methods used by mantis predators in the wild. Otherwise, trap it out like most people do and give it to someone with a species tank. Interesting though, Mantids don't usually find homes in Acros, as far as I know. There are a number of Alpheid spp. shrimps that are commensal with acropora's...they can make a snapping noise and are not dangerous. Can you elaborate what other evidence you have that this is a Mantis?
Stephen
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