How much surface area should I have in my incubator? Right now there are 6 contact lenses caps, so about 6 inches of surface water directly under the heat lamp that evaporate fast and one bowl about 4 inches of surface area off to the side that hasn't gone down much since day 1 (it's 12:16, so technically day 4 !!) How much should I have in there and how much more should I add for "lock down"?