I looked up the food you are feeding, and it doesn't look very good. There are seeds and colored bits in it, which aren't good for Guinea Pigs. They just need straight up pellets. I would recommend Oxbow (Which you can find in pet stores) or Kleenmamas (Which you would need to buy online). That cage also seems a bit small for 2 Guinea Pigs, so you may want to consider a bigger one, perhaps look into C&C cages.
Other than that, congratulations on your 2 piggies and enjoy the forums (There is lots of useful information here)! lol