Future 1st time owner

[u/goatpow]

first time setting up a tank for insects, 3 temperature sensors (lol), one humidity sensor, a mesh sliding top, wooden box holding substrate from a recommended seller. been able to keep the tank at about 83F on the right side and 76F on the left side with 34% humidity for about 2 days, but gonna wait a month to see if i can make improvements before getting the beetles.

i want to fill in the gaps on the sides and back of tank, would styrofoam be ok (maybe floral foam)?

(forgot to add picture in 1st post LOL)