First off, is your heat mat regulated by a thermostat? If not that is a must. Also, you need to know your temps. Walmart carries an Accurite thermometer that will measure temps in hot spot and ambient, as well as humidity. They are like $12. I found them by the indoor fans of all places. We need to know what your temps are. 65 is way to cold. Should be 90 in his hot spot, with ambient at 80.
Honestly though, IMO tubs are the way to go. Much easier to clean, hold temps and humidity, takes up less space too. I started with glass tanks, and switched to a rack system. I will never do tanks again.
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