79-89 year round.
89? Really. Is that a typo or does your tank really get that warm sometimes?
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79-89 year round.
Sounds to me like you should add a heater or two. Did you know that corals stop metabolizing (growing) at temperatures below 76 degrees. At lower temps everything grows (and metabolizes proteins, etc. including ich, and its believed RTN) more slowly also. That's why most reefers keep their reef at around 78. The range that reefers keep their tanks at are from 76-82 F. Very few keep reefs at or above 80 but corals can handle it no problem.
Having said that, I have my Ranco controller set to come on a low set point of 78 and shut off at 79. I have it set to turn on my room AC at 80. I have three 250 heaters to keep my 400G system warm in the Seattle winters with an unheated remote tank room. My AC III usually reads 77-78.
Sorry, not a simple answer.

