As for myself I can also comment on the heat. I run a chiller and have my tank at a stable 79-80 most days. I also never have my heater on but I do recommend as stated above replacing it. I have done a little mods that have helped with the skimmer to make it work 50% better and I can share this if anyone is interested.
I have replaced all my bulbs with ATI's as well.
I need a ATO soon as well
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