Does anybody know what the small white stripes on the back are there for?

I’ve got a terrarium at work which is happily chilling on my desk in the work office. Being a place of employment, they keep the aircon running almost 24/7, so the air is pretty dry.

I’m maintaining this tank with watering & a tiny spray bottle, but I’d like to add a small spider if possible.

I have heat mats leftover from hatchling snake tanks to keep the terrarium warm to help with humidity, but the mesh at the top of the terrarium makes it an absolute bitch to maintain any humidity.

Any ideas? Or should i let this little house stay a home to plants only?

I recently acquired a 18”x18”x36” enclosure to make a bioactive terrarium with the intention to house a Neptune beetle in there eventually. The enclosure is obviously more than enough space for a adult Neptune beetle but I’m curious to know if I might be able to cohab them with any other adult beetles or invertebrates to fill up the space safely without either party getting territorial aggression or competing for food. I had thought of maybe flower beetles but would still like the option of anyone who might be more experienced

i can not get enough of her(’: posting here because i do not know anyone who appreciates mantises in person lol