I use Niteangel desert sand, it is expensive for a bag of this in terms of size compared to probably other sands. But I use to use the tiny farms one till I heard it was not safe. Am from the UK but tend to just buy everything on the US amazon site as I find it slightly cheaper even with the conversion fees. But you can get it on the UK Amazon site, but just a bit more expensive. As I I tend to sieve out the sand it's a worthwhile investment. I trust niteangel as a brand, but obviously I can't guarantee it is fully safe, but it seems ok for me.
Amazon.co.uk