Just make sure one of the Korolias is causing ripples on the surface. This will help with oxygenation. Also, keep those K's clean. They work great if they are, but poorly if they aren't.
If you have a glass cover on this tank that may also cause an oxygen problem. Most in the SW hobby use a screen over the tank if they use anything at all.
Also, I would advise you to not get any corals if your tank temps may swing that much. two-four degrees, no big deal, but that is an 8 degree swing. That is really hard on coral.
Finally, coral won't survive most of the time when the tank gets that hot. I know it doesn't happen much in your area, so you will just need to plan ahead to make sure that doesn't happen again. Try not to get over 82-83. Your normal swing if you are not running some type of heater/chiller combo should be in the 76-82 degree range with your tank staying close to those parameters all the time.
Why am I being so picky about the temps you might be saying. If you would have had 10-20 sps corals in that tank when it hit 90 degrees odds are that all would be dead.
Hope this helps.