I used black foam board and black duct tape on my glass tank, helps insulate and the black on black don't look bad, do you have something controlling the heat lamp "thermo/rheostat"? I also have my water bowl directly under my heat lamp in the center of the tank so I don't have the temp spikes on substrate from the heat lamp.
Edit: What kind of bulb in the heat lamp? Daytime bulb would suggest you get night time temp drops when its off is why I'm asking.
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