I am adopting 2 ferrets, are these foods good to mix..?

Well i have 3 ferrets and i feed them Sheppard and Green which is great because its high in protien because its made with real meat!.. My girl wont eat anything but this food! Not even treats! My big boy crash loves it when i give him a little bit of cooked skinless chicken.. FerretVite is also amazing every ferret (except my girl) loves it and it comes in handy when you want to weigh your ferrets or clip their nails or even bathe them..Have fun with your ferrets!! I know i have lots of fun with my two boys!