I'm starting the hatch today and I'm a little worried about getting the humidity right. I have an LG still air without a turner or fan. The humidity has run about 48-54 during the first 18 days with just having water in the bottom reservoirs. SO, how many damp sponges should I add 1 or 2. I trimmed them down a little to fit in the bottom. They are about 2 by 5 inches? I was wanting to get the humidity to about 68, is that right? I know this is probably a try and see thing but if someone could help I would appreciate it. I don't want to open it after I get it set up.