You know that box ive got around my tank? I was thinking in sealing it up corners etc. Then putting a seal on the lid. Then lining the box with that bubble wrap insulation. Then putting the small green house heater in the box. I know the will be heat build up, So I was planning on drilling holes about 5/10cm from the bottom. So when the heat builds up in the box, It will escape through these holes while leaving the box filled with heat from the top, downwards. This should stop the heat building up to much right?