So I finally got my fish room how I wanted it 20 tanks ranging 10-125 gallons only issue is temperature room is insulated and has a door I bought a 1500 watt space heater got the rook to about 77 my tanks were at 75 which I was fine with I do have some breeding pairs... Not the room won't hold the heat I can't let the space heater run it will cost me a million dollars in electricity any other ways I could go about this .. The room is in my basement if it makes a difference