Bark is not a suitable choice of substrate for beardies. Even if you dont feed in the cage at all, beardies are curious, and they explore by using a behavior called Tongue-tasting. This alone will be enough to get them to injest some of the material. It wont take more than a couple pieces of bark to cause a fatal impaction.
Calci-sand is also an unsuitable substrate. Although the packaging claims it is digestable, it is not. There is no FDA for reptiles, and packaging can spew whatever lies the company wishes. They could say the sand would make your beardie grow an extra leg and still be able to sell it! Calci-sand clumps together into a jagged, hard boulous in your beardies intenstines, and can cause serious damage to their intestines, as well as causeing impaction.
The only really safe substrate choices for dragons are substrates that cannot be injested such as shelf liner, paper towel, tile, lineolium, or carpetting.
Here is a link to prove to you that cali-sand is not digestable
http://coloherp.org/cb-news/archive/vet-med/CalciSand.php
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0.1 Bearded dragon (Hannabil)
0.1 mexican Black kingsnake (Morticia)
2.1 Leopard Gecko's (Pogo,Jeffrey Nothing, Louise)
0.0.1 Tokay Gecko
1.0 Blue Tongue Skink
0.0.1 Reverse Okeetee Corn (Autumn)
1.0 Blood Red Corn (Virus)
0.1 Bullmastiff (Asha)
4.1 Cats (Poe, Tucker, Abhid, Felicity, Emmy)