Thankyou for all the help. I am just a bit paranoid about impaction because I used those "breeder's choice" substrate as they recommended on a lot of aussie and skink websites. I used to breed skinks, so have quite a few. For six years everything was great. Then one day one of the skinks got impacted and required the vet to take out a piece of the substrate from her gut. It was probably a freak accident, or perhaps other factors, but it got me so worried that for a long time I put everything on newspaper. I am just now starting to recover and just want to find a safe alternative. Nothing wrong with doing a bit of extra research, right?