BuildMyHabitats builder only offers safe substrate choices (including 50/50 topsoil and playsand) and excludes calcium sand, reptile carpet, and other unsafe optionsso your habitat is set up correctly from the list.
Fine quartz sand and bioactive soil mixes are acceptable for healthy adults with experienced keepers. Avoid calcium sand, reptile carpet, walnut shells, wood chips, and linoleum. Hatchlings should always be on solid substrate.

But no matter what you choose, avoid the garbage substrates like calcium sand, reptile carpet, and walnut shells. Your dragon deserves better than living on what amounts to a bacterial breeding ground or tiny knives.

From bioactive mixes to simple liners, this guide evaluates every major substrate to help create a safe, great home using the best substrate for a bearded dragon.
While calcium sand might seem appealing due to its perceived calcium supplementation benefits, the overwhelming evidence points to it being a dangerous and unsuitable substrate for bearded dragons.