So, I just took my 2 year old red foot to the vet. I have been using moss, cypress mulch and garden soil for substrate. The vet suggested to use newspaper instead, providing a type of "humidity hutch" made from a large plastic container that she said the tortoise would use as needed. According to her, any other kind of substrate is a parasite paradise. I'm torn, this goes against absolutely everything I have read. Thoughts?