hey, just wondering if there are any tricks for maintaining a good temperature in a glass tank. Right now ambient temps hover around 70-72F (live in wisconsin, temps have been pretty low lately). I have a heat lamp which does well enough, but the temp drops quickly due to glass not being very good at retaining heat once I turn it off, plus it saps the humidity. Theres also the under-tank heating unit, attached, which raises the temp a good 5-8 degrees. my substeate is a combination of walnut shell 'sand' (like small pebbles) and ground fir tree bark pellets. Keep in mind, I am a finantially-impared college student, so real home fixits are my forte. Thanks!