In agreement with the previous posters, we use playsand for 8"+ bearded dragons and paper towels for babies. In over 15 years, we've never once had a problem with impaction.
As a side thought, I would be concerned about keeping adults long-term on anything but a soft, loose substrate (preferably playsand) if your enclosure has a hard floor surface such as glass and it also includes climbing branches. Over the years, as the animal leaps to the floor from branches, half-logs, etc, it may cause discomfort/damage if there is not adequate cushion (paper towels, newspapers do not provide much). Sand provides a nice soft surface that doesn't jar bones. This may cause issues in elderly dragons.
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