I had a transparent 80 L plastic tank full of egg crates, the humidity was between 50 % to 60 %, it seems that above 60% there were more deaths. Temperature is 20 ºC.
The food was apple, carrots and cat biscuits.
I only had like 10 nymphs with 18 adults, there were like 6 females and the rest males.
I say "...I had..." because I stopped to use egg crates because I prefered to see them when I wanted and they were always hidden. Without egg crates they stopped reproducing.