By the way, if the gap of air space under your tank is too big (as yours apparently is, as per PM), you can buy some inexpensive ceramic tiles* to function as a
'heat sink': they'll reduce the excessive insulating air space while retaining heat & even help protect the surface of wood furniture if that happens to be what your
tank is sitting on. (wood furniture subjected to UTH over a long time tends to dry out & may even crack a little, even if the UTH isn't touching the wood)
*Be sure to measure the gap under your tank first, then check with local "floor covering" business (they usually install carpet, tile & vinyl) for a few spare tiles of
the size you need...they sure don't have to match or be pretty. When I asked about a few tiles at my local store, they practically gave them to me. They often
have a few tiles left-over from installation jobs...But tiles come in many sizes, so measure the space under your tank first- the width, length & height.