I believe it would be best to use water from your display for the water in your QT, thus eliminating the typical ammonia spike problems.
As for temp, my tank spiked up to 89 with a problem. My zoas closed and my 24 head frogspawn melted but man was my gig lookin good. I usually keep my tank at 83-84 like minh. Had my big blue for a year now, no problems.
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