So I'm going to use flex watt in my BP tanks and I was wondering A) Anyone know a reputable site to buy flexwatt from that ships to the US? B) if my tank is 1440 square inches (48"x30") of flooring how much of the floor should be covered with flexwatt? estimated 960 square inches based on another post where the poster said 2/3 of the tank. I left a 3" gap between the floor of the tank and the floor of the room, was gonna cut a hole in the floor of the tank and router a ledge for a 28"x35" sheet of glass to sit on top of and attach the flex watt to the glass C) Will this be fine? and how would I attach the flexwatt to the underside of the glass? or should I just attache it directly to the inside bottom of the tank like I see in peoples photos on google?