The heater is for those surprise cold nights when you leave the windows open or surprise hot days when the a/c blasts arctic air into the house. That heater keep the temp from dropping below 78 as that much flux is too much. Make sure the heater is set correctly, then leave it in there and monitor it just like you monitor all the other equipment.

I got 2 8 inch all plastic fans with clips at WalMart for 9 bucks. They are totally quiet. Took 9 degrees off the tank temperature by blowing one over the refugium at low speed and one over the center brace at high speed to get rid of heat from the lights. The fans come on with the lights. My heater keeps it from getting too cool. Tank temp runs about 78 to 78.5 degrees, 24/7. It used to run 82 to 87.5 before the fans if my a/c wasn't running hard.