I recently tried the perlite method in a small Tupperware container about the size of a shoe box. I had trouble at first with water droplets dripping from the top of the lid. I got a cotton ball and some vaseline and coated the lid and the problem is resolved!! For warmth I place the container on a heating pad with a hand towel between them and i got a temp. of 77. So far everything is going great!
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