I dont got to worry about humidity because there is hardly any in my apartment or in the jar and its glass and never had any to begin with.The.only humidity is in my little 3 gallon tank I use to hatch creobroter ooths and I understand everyone but still I got faith enough that I can make this My beliefs is that with hard effort and work anything is possible and with the right attitude and right preperations anything can and will work if applied properly and given a chance.I got lets see prob 30 or so nymphs maybe less but never counted them and if they eat each other thats ok its not like they cant be replaced and since I got also 4 in mason jars and bout 12+ in oceanspray and some other fruit juice containers I am good to go!Checked on them today and their all still alive and well so one misconception bout airflow has been written off and all my critter keeper mantids have dirt for their floors and never had any fungi or mold problems!