Ok... well the problem with adding another tray, is that the tray that turns the eggs has to slide back and forth and there isn't enough space, important to add we have had successful hatches with this incubator...but I moved it from my parents house to mine, where I think we have less humidity in the air due to heating source in the house. Hence why I added the washcloth... my hydrometer alarms when the humidity drops below 30% so I am able to dampen the washcloth. Umm, oh for the hatch I can add another tray of water, last time I used washcloths and a spray bottle...anyways, guess I just will just see how it goes. I know lots of people do use homemade incubators...cant afford to buy one!
Do what works!!
Home-made----look at my pic----those are home-made using what I had laying around and ordering what I did not have. I had to spend about $60 in the hatcher and about $200 in the incubator to get them finished, which holds 288 eggs. I Like---no Love home-made.