My ball is in a 40 gallon too. I do have a mister on the tank but it is more for the live plants, it does not keep the humidity up. With two humid hides keeping the moss damp during a shed I have perfect sheds. I will still mist during a shed but nothing like I used to. Just once every day or two during a shed. I also have most my screen covered with foil tape and use cypress mulch.

During a non shed time I dampen my moss in the hides and let it dry out and then dampen it again. During a shed I keep it nice and moist. I Just place moss in my hides.