I've had my big male (I think) now for 7 years now, and the only feedings he has ever missed is when he's shedding. But the last two weeks I've tried to feed him he has showed no interest. I tried on 10/31, and today 11/7. He currently weighs 1870 grams. He's in a nice sized tub, and has been for 4 months now, never any problems. His tub is heated by heat tape and is always at a nice 86 degrees inside the tub. However, this is his first winter in a rack system with 4 other balls, two of which being female. Any suggestions? Is it normal for them to stop feeding this time of year?