That's a lot of nuts! Well, i just put him in my little tank. I hope he doesn't whack my snails. I'm gonna attempt to feed him mysis shrip to keep him happy. Think that will work???
It's impossible to predict a mantis' behavior, but if I was a betting man, I'd still think it would take out other inhabitants like snails and hermits.
Personally, I could never get myself to set up a mantis-specific tank Mine, stowed away into my 120gallon, has been a mass murderer of fish.