My sons tortoise Tank - (who weighs 32 grams) keeps ending up on his back. He is eating, drinking, defecating. I am not sure if this is normal or not. His substrate is aspen - but Gypsy who weighs 50 grams does not fall over. I know I have a week "warranty" on him - but I could also take him to the vet. - but I also do not want to freak out if this is nothing as well (the reptile vet is not there every day)