It could be the smell. If the tub for the tower of fun is new it can have a strong plastic smell and your ferrets may not like that. I would suggest suggest somehow blowing air through it for a while to clear out that smell. You can also try and run some of their used bedding up through the tub to get their smell in it. Our ferrets were slow to take to the tower of fun but they warmed up to it. Good Luck Mike [Posted in FML 6363]