I would put the food and waterer on a piece of 2x6 or a brick or something that raises it slightly. Did you say they'll be in the box for a few weeks? Do you have more boxes or something to move them to if the box starts to mush (moisture happens in brooders.) I do think you're good to go for the first few days but that you'll want to change the box out eventually. Maybe find a bigger box as they grow ?? Some people who brood indoors use inexpensive little tents. I brood outdoors but I'd really try that if I was doing indoors again. It's great you did the test, *93 is plenty for the first day and you'll just go down from there. Hope you post pics of the little's!!