I'm so sorry to hear about your baby Chase13. If I were in your shoes I would use a combination of methods. The problem with the CO2 chamber method is that reptiles do not use nearly as much air as mammals, so this is not nearly as affective for them and takes a very long time. What I did once when I had to put down a deformed crested hatchling was to place it in a mini-CO2 chamber for several minutes in order to hopefully take away any pain (the CO2 has a numbing affect) to prep it for freezing, and then I put it in the freezer in order to finish the job. I don't really know how affective the CO2 really was, but as least it helped me to feel better about it.
