Shops tend to give advice from the manufacturers that they order from, a lot of the time recommending goods that aren't always the best. It's often good to consult with long term keepers and breeders as well as perusing resources in your own time to learn the best keeping techniques! Some just come with time and experience! I would greatly recommend slate tiling, it's good for the dragons nails too and easy to clean, doesn't pong.. The lists of positives are endless. I only mentioned the bran because of the loose particles maybe? I can't say for certain as I've never experienced allergies associated with lizards before, sorry!
''..An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men..''