He has used the bathroom, thats when he went from 850 grams to 800, that was full with a rat, to empty with nothing. He is now sitting at around 768 grams.
So it was 850 full, 800 empty of rat, and poop, then 768ish since. He roams a little bit at night, more than usual, but thats the only change. Im not stressing, because aside from the not eating, hes fine, I havent heard a wheeze, or anything. He sleeps, drinks etc fine.

Thanks all,

Matt