we used to own the arizona gecko co. back in the day. we were one of the first in the us at the time to have consisant captive breedings and hatching..we would always put the eggs in dry sand in a deli cup and put the deli cup into a 5 gallon tank with about 1" of water on the bottom, we used screen to elivate the eggs 7" off the bottom..I have published several documents as to the houseing, and breeding of vipers some are still in use today..vic