Really? Must be nice. My male normal was the only one who quit eating for about 7 months straight. He's back on steady now, but my pastel male was about once a month during season, and now nothing. They can be such pains.
I keep my adult males at every two weeks, but I like to keep the babies going. Male or female stay every 5 days until 500 g's then they get bumped to every 7. It doesn't hurt to feed them if they are hungry, but I breed rats, so I also do it to keep the population down. Lol. I guess it's different if you buy.