Peppermint shrimp don't click or snap or bang anything. I doubt it is the peppermint. You could have a mantis in your tank for years and never see it. They can hide deep in rocks and only come out at night. The hitchhiking variety of mantis are usually army green and are quite camouflaged. The last time I had a mantis he was in there for months, like 9 months or so. I did see him (ever) until I worked on my 150g aquascaping this past august and left one rock out for too long. It just happened to be the rock
he was hiding in and he jumped out of the rock and onto my shoe. Scared the bajeesus out of me :-)
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