Thanks everyone. When I first started I used paper towles and excelsior but between mismolts, nymphs getting stuck to damp.....almost sticky papertowls, the time I would spend cutting the papertowels into the right shape (one circle on the bottom otherwise they would get lost or crushed in/under the towel) and the fact I couldnt stand the thought of them just walking around on their poo I switched to exo terra coconut subtrate. I keep up on using spring tails in all my containers so mold is seldom an issue. I have just noticed thru trail and error most of my mantids seem a lot happier with some plants around. Whenever I would lift a lid most of the ones without anything in there cups would come running out and try to climb or hide, whereas most with plants just kinda hang out and wait for the magic food bringing tweezers. The room I keep my bugs in is in the basement with no "real" light but thanks to my awesome husband they have synthesized lighting. Around dawn led lights come on to replicate natural light tones, and change thruout the day, and eventually fade off around dusk. They have it better than I do, I swear