Hello. I have been using ZooMed Eco Earth loose coconut fiber substrate. I tried to spray their enclosure but it only dampens the surface but quickly dries up. So whenever they walk, lots of dirt raises in the air spreads all over the room. Is there something wrong I’m doing? Do I need a humidifier? If so, which one and what tips can you give me to help keep the enclosure moisturized? Thanks. The torts are a few years old. Thanks