My opinion is that if you have a mantis...you'll see it soon enough. I think they are must less shy than the pistol shrimps. Look for the mantis to be peering out of a hole in the rocks.
Most all the mantis that we see as hitchhikers are the smasher type. I don't think they are too interested in fish. Mostly crabs and snails.
If you do have a mantis and do want to remove it (IF)...I recommend keeping them in a separate tank rather than killing it. They are quite entertaining.
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