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Depends on what you feed them. What you feed the what you feed.Do they all have the same nutritional value? One of the cheapest I've come by is chinese.
And what honestly is the nutritional value on them compared to say...a cricket?
Disclaimer: No mantis were harmed in the making of this post.
I don't think springtails would work to good. Mantis tend to climb to the top of things and wait for a meal to come by. Not near the ground. But I'm sure it can be done.