The concept behind these boxes is a popular and proven method of incubation. Whether you use straight water or some other saturated media, such as vermiculite or sponge, won't make a huge difference, IMO. I have used them and preferred wet vermiculite. I would be concerned sponges would result in mold or mildew growth, and I am always paranoid about water splashing up should the incubator ever be moved or even bumped.

My issue with the standard boxes is that they are small and I learned the hard way that chondro eggs, and probably all reptile eggs, need to breathe, especially in embryo's final stages of development, and the amount of ventilation provided, size of box, and number of eggs per box is important. Can they be used successfully for chondros? Yes, and have been. Personally, I would want to limit the number of eggs per box to about 5 or 6, and provide ventilation holes as well. With that in mind, it would be more cost effective to create your own egg box, or go with their larger size box.

You mentioned your incubator performs best in the mid 70's. I do not think anyone incubates below 86, and many go higher than that. Just something else to think about.

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