I guess your right... I didn't think about that. I was thinking the pump was the main culprit but when your talking about wattage my heaters are going add up way more than the pump :/ I guess I better figure out how to run a line from my water heater!
As for heating the room I know what your saying because right now I keep my house at 70 degrees and the fish room is always about 76 because of the tanks lol I could figure out how to flip it the other way!!!
Hello; The energy from the operation of the tank equipment is all eventually converted into heat. This heat energy should be moving into the rest of the house and in effect reducing the energy needed to heat the rest of the house. If the door is open there should be a convection flow of warm air out into the other areas of the house and some of the cooler air back into the fish room. If the fish room has exterior walls it would save energy if the wall and ceiling insulation is beefed up.