I have just completed a new enclosure form BP that is 48 x 48 x 48 giving it just shy of 480 gallon. We made it out of oak plywood for durability, slate rock for the bottom. We also did a homemade waterfall about 20 gallons that filters the water for minimal up keep. We added bamboo poles, shelves, greenery etc. We are finally waiting for the tempered glass. I ordered a few heat emitters for the constant warmth. My question is how many 150w emitters will I need to heat this enclosure. I have been told many options some say four and placing 2 in the back and 2 in the front. I have also heard 6 emitters; we just want to be sure before we add her. Any suggestions?