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The heat bulbs are your main problem, they kill humidity. Tubs are so much easier when it comes to controlling environmental conditions, but if you're set on using a tank for aesthetic reasons, then a custom piece of plexiglass is definitely your best long-term option. Damp towels or aluminum foil work well short term, and a warm-mist humidifier placed near the tank will help as well. Also, if you can possibly cut back to one lamp and insulate the rest of the tank as was already stated, I would recommend that. When you say the temps were "a little on the cold side" what are we talking? 70-75? And how are you measuring the temps?
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