I just want to share my experience with the substrateless incubation method that I used this year and maybe help out some other people that are considering this method. I'll start of with how I set it up this season. I only have one breeding pair right now so I have a small Farm Innovators Reptile Incubator that I purchased on Amazon. In this incubator I placed a 7 qt sterlite tub, the same type I use for hatchlings. In the tub I placed a few pieces of PVC fittings and on top of those I placed a piece of light diffuser. Then I filled the tub with water about halfway between the bottom and the light diffuser. I then covered the tub with glad press n seal wrap. I cut a small hole in the wrap, just big enough for the sensors. Now here are some things I will be changing for next season. First of all, I do not reccomend the incubator that I used. The temperature sensor went bad while I was waiting for the eggs to be laid and I needed to contact the company for a replacement. Luckily this one lasted for the entire incubation period. Also, the humidity sensor on the incubator was incorrect as well. I have a secondary sensor so that I could keep an eye on temps and humidity. This sensor I trusted a lot more. Secondly. I checked on the eggs about 3 weeks into the incubation period and noticed that they were indented and I really have no explanation to it. Humidity was 99% I'm not sure if it will help, but next time I'll fill the bottom of the tub with perilite and water and see if it can be prevented. Which brings me to my next point. The eggs have started to pip and I just realized that they might fall go through the holes in the light diffuser and drown themselves. I will need to figure out how to prevent this, and I'm open to suggestions. Next season I will put some type of mesh over the diffuser. I will definitely be using and trying to improve this method in the future. I hope this is able to help someone. Please feel free to chime in with your experiences and how you would improve.
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