Alright I just got a tiny Hamata and to give it high humidity I made a makeshift terrarium by turning a glass cookie jar upside down on a dinner plate with the Hamata inside. So far humidity has been nice and high during the day but at night I needed a way to cool it down. So I froze a bottle of water and at night I put it inside the cookie jar. It seems to lower temps nice and low like a charm.
But, for some reason when I put the frozen bottle in the jar the humidity dropped rapidly. The plant seemed fine and is blowing up a new pitcher but I'm kinda worried about the humidity drop. Why would putting a frozen bottle in the jar destroy humidity? I'm not sure how far it drops but all the condensation dries up and the plants leaves get dry.