When using my glass setup I actually insulated the tank with this stuff. Only used it on the bottom though.
http://m.homedepot.com/p/Reflectix-2...ion/100020855/
When I setup the heat for the enclosure I put all the heat sources on one side of the tank. In this particular scenario, it created a perfect hot/cool side. I used a bulb that at first was on a dimmer but eventually hooked it up to a proportional thermostat so I didn't have to keep adjusting the dimmer.
Since I had a screen mesh lid, I actually used some of that insulation to create a removable cover to help keep in temperatures and humidity up.
After I was done I put a white towel on the top so it looked a little nicer.
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