Feeding question

Ok, Victor my male norm, i feed him once a week. He has never refused a meal. I'm in the middle of doing f/t. But my question is, at petco and pet-depot all they have is white mice, 15g tops ive been getting 10g.

Ok Victor weights 223g. And your supposed to feed him 20%? Does that mean i need to up his meals from 1 to 4 mice? or just up it to 2 for now?

I would just feed him two. If you can, see if he'll take one rat that's about 20-25g. You want them to switch to rats pretty much ASAP so you aren't having to feed multiple mice (like you are finding out).