Welcome to the site!
Wondering where you got your hatchling? Typically reputable breeders will ensure that hatchling have had atleast 3 consecutive meals before selling their offspring. It would suprise me if a 3 week old snake was well started from the breeder.
That aside, I would ensure that your new snake feels secure and is left alone for a week or so to acclimate to his new environment. If you can, black out the side of your tub and put the snake in a low traffic area. After a week or so of no handling try and feed an appropriate size f/t mouse ensuring it is hot enough for the snake to be able to sense it. Feeding F/T to hatchlings can be a chore, typically I would feed a LIVE hopper mouse to get them on food. What size of mouse have you been offering?
Make sure your husbandry is up, tone down the heat a bit maybe. I wouldn't be letting my tubs get to 95 degrees, keep them at 90. What sort of hides do you have in a 6qt tub? 1 or 2, identical?
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