oo if you have any contact with that humane society at all, let them know they need to get a pellet brand with no treats in it. just pellets. the treats lead to malnutrition, which can affect teeth and lead to malloclusion, or blood problems, bloat/diarreah/const., or hunchback, which the beige looks like he already has signs of.
timothy hay, straight plain chinchilla pellets with no treats, and at most one treat a day (ie. one or two of those orange flake things in the food would be considered "1 treat").