I wanted to ask how long one would consider feeding the 2018-- the baby formula of HT-- to rats. What's the 'cut off' age? I've come to realize that with 33lbs of the stuff, I have way too much! I would assume something like 8 months, right? Will it hurt Rose and Guild (who're about 9 and 8 months respectively) if I were to feed them the 2018 until it was gone?