Guinea pig food is not just pellets or specialist dietary foods, guinea pigs eat many other foods such as vegetables or fruit. They absolutely love hay and grass and just like gerbils they need to keep chewing as this grinds their teeth down as they are constantly growing.
Specialist food can be guinea pig pellets which are high in vitamin c or museli. They very much enjoy Timothy hay or Meadow Hay. Alfalfa Hay has too much calcium in it for them.
So can gerbils eat guinea pig food?
They can’t eat their pellets or museli. However they can eat the same Timothy or meadow and many of the fruits and veggies that guinea pigs can have, gerbils fan have them as well.