alot of mine will eat every day. if hes 300 grams you might want to look into feeding 2 mice or switching to rats. sometimes if you dont they tend to grow slow.

i feed my males and females differently due to what was already stated, but i do typically feed my males every 5 days till they are around breeding weight and just before breeding season i might go to every 5 days for some if i feel they need more.
for females most of the time they get fed every 5 days, just like stated in the post before this one.