I wouldn't be concerned within the first week if it's not eating.
The setups large breeders use are quite a bit different oftentimes than the vision cages we use so that can take some adjustment.
Not pooping is hard to say unless you're keeping them on paper towel. It does occasionally end up in the substrate making it more or less invisible.
Temperature sounds fine and since you're purchasing avhygrometer that should also be fine.
You're also correct to assume you may not see the food disappearing.
Until my crestie hit about 8 grams I didn't notice that much food gone ever and now she clears the bowl.
Sent from my SGH-I337M using Tapatalk