Something not right with your closed chamber then. It needs to be as airtight as possible. You must have some holes in the top where the moisture is escaping. With an airtight closed chamber you shouldn't have any problem with humidity and you shouldn't have to mist. Can you post pics? Maybe we could help you figure it out.It is damp but the humidity above the substrate goes down so quickly. I know we have to spray and add water throughout the day. I'm trying to figure out how to keep it up with out having to spay it 5 times a day. I'm currently not working but when I go back to work I want him to be ok while no one is home.