[Frankie]

Where i have to agree that a lot of reefs are in the upper to mid 80's there is a lot more then that just going on. Reefs in the wild are fluctuating in temp. constantly with cold water pushing up from deeper in the ocean and just below reef walls. Upper and more inland reefs get warmer from the sun and so on. Good info from Stan & Debbie Hauter JFK, i read there stuff all the time. I have to say that you do have great success with your tank at that temp. range. Most people that keep sps in that temp. range don't fare so well. Also warmer tank temps tend to breed diseases and algae easier. I tried to keep a chiller off my tank and just got sick of the temperature swings and corals dieing. Now that i have a chiller i see my corals finally surviving and growing. There are other reasons like oxygen levels and Ph ect... to keep in mind when setting on a particular temp. range.