Due to major remodeling, I have to put 2 of my 130gal tanks (with 1/2 inch thick glass). 1st tank has 2 x 6" S. Arowana, 1 x 6" Australian Arowana, 2nd tank has 1 x 6" sun catfish, 1 x 7" Syno catfish,in my covered patio for the next few months, I am in Sacramento, N. Cal, the cold weather at night might reach 30 degrree some nights, what would be the best way to keep the tank around 75C - 80C? Plus what else I should be aware of? Thanks.