Hi,
Thanks for the information, particularly concerning the chamber. Do you need to keep the Ytong moist?
I was going to use the flies, because in the UK you can buy fly larvae for very cheap at fishing tackle shops, and then pupate the larvae in a very warm environment. I fed my mantids exclusively on gutloaded flies and was able to produce several hundred flies per week with minimal effort, so i just saw that as a better way as crickets are ridiculously over priced in the UK. I also have a thriving blatta lateralis culture which i could feed alot from.
do you heat the nest with a heat mat? and do you heat the hunting area too? if so, What kind of temps?
Thanks for all your advice!

best regards,
Guy