used fishtank, me too
I house my corn in a wonderful hand-built ex-saltwater fish tank vivarium. The man I got it from made it out of 3/4" plywood and painted the inside with waterproof fishtank paint. When I recieved it I cleaned it much as the other posters explained, MAKING SURE to scrub all of the corners well. I rinsed it completely a few times with clean water and did not put her in it for a week, mostly 'cause I was setting up heating and testing temperatures, but also to let it "air out".
She has been thriving in it for 2.5 years.