I concur with all of the above, one caveat that I would stress is watching that temp throughout the night. Though some reefs have temps as high as 87 to 88 degrees, it doesn't mean you are out of the woods if your tanks reaches those temps. Keeping in mind those corals are fully acclimated and well adapted to those temps, your tank isn't. The clip on fans work well and I would advise one on each end and monitor the cool down to prevent a rapid drop during the evening which could happen. Those fans usually have a high and a low setting. If there's a cool down, you may want to set them on the low setting and monitor it. It appears that you reside in Florida and depending on how the temp my change during the night, you could very well cool the tank too fast if you are using frozen ice in the zip locks. Any intentional temp changes, and I'm sure you are aware already, should be done gradually. With the increase in evaporative cooling due to the added fans, I would also closely monitor the salinity. Hyper and hyposalinity can also cause bleaching and mortality.
BTW, what is your normal tank temp?
Much luck my friend.
Mucho Reef
