6 inch would be more than you would need. 11 inch would be way over kill. but 11 would only have to run a little bit compaired to 6 inch. but i be the difference in eletric would be the same.
do you think it would be wise to insulate it. I have some spare insulation from when i was remodeling my bathroom and kitchen. Do you think it would cause a fire hazard if I used it to insulate the rack? It think it is either R-11 or R-13.
Actually I got home today and decided i didn't like the way it looked and didn't need all the space for adults so I modified it to take smalle ones so I can have room for hatchlings.