My 75 temp as of right now is 87.3F and I do not even have the heater plugged in. For lighting I have a PC strip with a total of 130W, 2 65W bulbs. How do I control this temp.? My tank sits in the dark no sun directly shining into it so why is this tem so high? I don't plan on buying a chiller or can I really afford one so what else can I do to knock the temp down?