the dog food you listed is really too high in protein,16% - 19% is about right.what concerns me more is the food dye especially the red food dye,it's pretty well accepted that red food dye is not healthy for reptiles.
if you get 6f in 50lb. bags i'm sure the price is close to dog food prices (i'm buying 6f for $22) so as connie pointed out why not just use a product that is designed for rodents to be fed to reptiles?