My Ball's tank humidity stay in the 30s. I added moss to the hides a few years back and don't have to do much else but dampen it once it dries out and keep is moist during a shed. This has given me great sheds even with low humidity in the tank. I do have most of the screen covered and that will help but it is usually not enough to fix the issue. Some moss can do a lot of good for your snake. It creates a high humidity level inside the hide and since that is where your snake hangs out most of the time is benefits from it a lot with mold or RI issues.