Help with brumation

[NikOverton]

This is Perseus's first brumation he's 1 year and 11 months old. I was wondering what special precautions should I take? Should his temperatures Stay the same? Should I still offer a basking spot? should I still bathe him? He's outgrown his hide and the local Petsmart doesn't have one he can fit so he's currently sleeping on the floor of his viv. I put a black t-shirt in his viv this morning that he could use to go under. Anywhere online that sales larger hides? He's 21in and last vet visit he was 800 grams