hello! so my Russian Tortoises has been burrowing in his cypress mulch substrate. I know Russian torts tend to burrow but I just want to make sure it is safe for him to burrow all the way under head and everything! I’m worried it will get in his eyes or he won’t be able to breath properly and such. I’ve only had him a day or two and he has never been in substrate of any kind before. Right now I’m just letting him do it but it makes me nervous I’m probably overeacting tho I would just like some conformation that this is safe for him.