Hi all,
I don't feed much dried food, so even the small tubs are always half full when the date expires. I now mix a small amount of flake, algal wafers and Astax Red crumb together, enough to 1/2 fill a small flake tub. Weigh it, and then mix all the rest up and freeze it in 1/2 tub portions. Then even if I have some left in the tub in the fridge, after 6 months I throw it away and get a new bag out of the freezer. I know I'm a cheap skate, but it does cut down on waste.
I used to buy coffee beans and grind my own when I needed it, and I got the idea from there, if you store the coffee beans in the freeze you can get the "freshly ground coffee taste" from beans which are years old.
cheers Darrel