I tend to try and get many of my animals I am keeping back to take F/T it makes it easier when the rats run short. As far as selling them eating F/T, I have fed an animal or two F/T just to make sure that they will take them. Many of my animals as babys are such great eaters that they will go back and forth..Now I do have some that will eat F/T for months then just decide they want no part of it any more..