No, the fishroom is temperature controlled by the window A/C. It is an 8,000 BTU unit, and I keep it at 78F. The tank fluctuates from 79 to 81.5 daily (or less).
During the winter months, I don't run the a/c at all. I'll crack open the door to the garage to let cold air leak into the room to keep the lighting from heating the room too much. Since I work out of my home, I can check the thermostat each time I pass the tank to see if any adjustments are necessary, but as we head into the summer heat, the a/c will simply stay on around the clock, cycling on and off as necessary.