I just bought a Critter Cage 20L tank - it's 30x12x12; so to answer one question you asked, no, your size tank isn't too big IMO.
Here are some pics of the process I took of insulating the sides and back of the tank as well as insulating the tank lid.
Supplies:
- cork board squares (I bought a package of four at 12"x12")
- 1 roll of duct tape (I bought a medium roll and black in color - I would buy the big roll)
- aluminum foil
- utility knife
- cutting board
- scissors
Method:
1. Open cork board squares. Hold up to one end of tank and measure off size for glass surface area. (I used a pencil to draw off a line where the cork board was too big, then cut the extra off - SAVE FOR LATER)
2. I taped one piece of tape from top to bottom going through the center of the cork board. I then taped off all four edges of the cork board so it was positioned and stuck to the glass/plastic tank edges. [Do this for both ends]
3. Take the 2 extra foam pieces to use for the back of the tank. You'll need 3 of the 4 extra cut pieces to use to help cover the back of the tank. I positioned the three skinny slivers in the middle and put the two whole pieces on both sides of those. I taped using the same method.
4. For the lid of the tank, I stretched out 3 pieces of aluminum foil that would fully cover the lid. I folded the 3 foil layers over on all four edges to make it fit slightly smaller than the mesh screen of the lid. I then put a cutting board under the foil and cut out a square shape through all three layers of foil for ventilation/lighting to go through.
5. Next I taped down the foil to the screen/lid and taped it down COMPLETELY. The only thing showing of my lid is the square for ventilation and lighting. Everything else is taped so as little air as possible can escape.
6. With my extra tape I finished taping up the sides and back of the tank so it would all be black instead of having areas of cork board showing. (I ran out on the back in a small spot - that's why I'd get the big roll of tape)
Here are some photos of my stuff:
I apologize if they're hard to see, but it's the best I could do with what I had available. If you need further instructions or have any questions let me know. Obviously you don't have to do it like this, but this is what I chose to do after someone showed me this method. Hope this helps.







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