You can use any kind of tiles that you want. You can even use linoleum or shelf liner if you want to. Just depends on what you want your cage to look like.
If you purchase something that's been treated, just make sure it doesn't have a strong smell, and also make sure that it isn't too slippery (for instance, self liners are fine, but get something with bumps or grips). Beardies get uncomfortable on slippery surfaces.
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