I have always set my heaters to a high of 78.0 F and my chiller to a low of 82.0 F.
It is not that you cannot keep your reef at 75.0 F, I just believe that you put undo stress on the occupants when you keep your temp on the low side. For example if you have Tangs I believe you will experience more symptoms of ICK at the lower temp. I also believe that your corals will grow much slower at lower temp.
However one thing have noticed in this hobby is that no two people are following the exact same practises and yet we all have certain success with what we do.
Tom R
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