On the bottom of the tank, use a thinner piece of 'paneling-type' material called luaun...it is 1/8" thick, & is sold in 4x8 sheets at Home Depot/Lowes, etc...however, MAKE SURE IT IS NOT CEDAR...sometimes, they construct it our of cedar chips...
ALSO, make sure you use an adequate sealer, i.e. Thompson's sealer to treat the inside of your enclosure with, or you will lose ALL humidity...DON'T forget to allow the pre-treated wood to cure for 4-6 weeks to eliminate the possibility of injury to your BP
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