They grow about an inch in their first year under the best conditions. They won't be a problem for a long time. You may consider keeping them until they get older. They will likely cannibalize eachother until their is one or two, then feed the winner daily. A full mantis most likely won't attack anything but the occasional snail or hermit.
Dan
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This laughter is ill-informed!
"Sanity? What would I do with something as useless as that?"
-Kennpachi
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