Gabriel ... if there is a flaw, I will find out with my 2nd batch going in my 15 gallon tank tomorrow. I finished it up a few seconds ago. For the bottom where the eggs will lay, I turned my 10 gallon lid upside down in the tank. WALA. (EDIT: Metal mesh) This new batch of eggs are from my chickens. No traveling, no postal service, no heat/cold or x-ray exposure. We'll see how this goes. I must admit, even if my hatch rate isn't high, I love the constant view. However, I'm now down to 4 eggs ... 3 from the travel & 1 from my unknown mix. How are yours doing?