I am using play sand at the moment, but it is so messy, there water bowl is always full of it and their veg, I am worrying all the time when they are eating their veg, as the veg is wet and sand sticks to it like glue, I was thinking of going to Lino, cushion floor, but the big Bearded Dragons are much messier than the smaller ones, I don't think it would be appropriate, its pretty difficult keeping the little ones clean, I am thinking of changing theirs too, the lino looks fresh, nice and clean when first down, but it sure does stain when they poo on it, so I have to keep buying fresh rolls of it, even with bleaching the stains still remain, I don't want to use to much bleach as the cushion floor could soak it up and would be hard to get rid of.
even tho its stained, and clean, it still looks dirty, so I wont use it again, I have to measure and cut a new piece lol,
I was using newspaper for the cham, and it seemed to kill off the locust, they just weren't surviving, so he is just on plain white paper now, and the locust are surviving. the paper I am using for the cham isnt appropriate for the Bearded Dragons, so I don't know what to do
i have racked my brains of what I could use for them, i also think the repti grass isnt good enough for the big Bearded Dragons, they eat so much, and looking at the state of the sand after a day or two, the grass wouldnt last two minutes.
Really the only safe, completely-without-risk substrates are those that are not particle; newspaper, paper towels, etc. 
