I hope you're not feeding that pet store food to those rats. You won't have healthy rats which will end up not giving you healthy babies. A good diet is extremely important to their health and well-being. To keep them well-fed on that junk, you'd probably go through a bag every 2-3 days. Try and make my mix for them, it will save you alot of money and they won't waste any of it. Not to mention all of my mix ingredients are digestible, whereas the premixed junk is just full of fillers like corn, alfalfa, those small seeds, and sunflower seeds. Dried corn can contain an aflatoxin(is found in mold on the corn) that can kill your rats, so it is preferred to never feed a mix that has whole dried corn in it.

Try Mazuri Rodent Blocks(Breeder 6F is what I use). It is made by Purina. Lab blocks and the mix I wrote up(is a Sticky) would be the best possible diet for your rats, especially if they will be breeding.

PS: Your male is not gray, he's BLUE! and American Blue at that