Thanks everyone for the replies

We did have some moss in the viv but we had taken a lot of it out because that's where the crickets liked to hide and we didn't want him to eat any.

We've decided to go with paper towels. There are some things he's been doing since we got him that the vet said weren't normal, so we're going to keep him a bubble boy lol hopefully he won't get sick again but I'd rather not risk it.