I don't know what stage of the mantid you're going to use as feeders. If you plan on raising mantids to adulthood and then using them as feeders, all I have to say to you is good luck. With your intentional raising and use of adult mantids as feeders, I'm pretty sure you'll end up quitting at round one because getting mantids to adulthood with the intention as feeders is not an easy task. The time, energy, and money you put forth getting a mantid to adulthood is high. Even if you do succeed, you'll only get a few adults from the hundreds that may hatch (mass producing mantids is tough). You can do what you wish if you have that kind of time, but the way I see it, it's a total waste of energy put forth.