I asked this question a while back and I found the easiest way to have two species with their own specific temps it to wire each shelf of flexwatt individually. Then either hook these shelves up to a different thermostat or a thermostat on a dimmer. Corns are rather forgiving so putting them on a thermostat with a dimmer should not pose a threat. Ball pythons need pretty specific temps so I wouldn't try to find a "happy medium" for a rack with two or three species. Someone will suffer.
Also. http://www.thecontainerstore.com I use mens shoe boxes for babies and boot boxes for adults. They also have a largerer under bed box too.
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