For everyone that says to take your beardie out,and to not feed on sand,
What do the animals do in the wild!!!
Out in the desert they feed on sand and dont suffer impaction.
One thing i would say, i keep my beardies on sand (Touch wood they are fine!)
My friend kept one on the 'bird grit' stuff they now try to sell you, the dragon went wild eating the bird grit and a week later it died.
So i have kept mine on sand for 2 years fed in the viv and both ok!