Join Date: Sep 2017
Location: Apple Valley, CA
If 84 is the max it gets, you should be okay for many/most truly tropical species, especially if that temperature is only experienced temporarily. Most fish live in water systems that experience temperature swings wider than most of us may realize. Even in the Amazon, sometimes the water can be in the 60's during certain times of the year.
Basically, if your water temperature is swinging from 78 to 84, providing it's not super fast, and the fish only experience 84 for a few hours before things start to cool off, I wouldn't worry about it. Alternatively, you could take the top off and have a fan blow directly on the surface of the water, creating an evap cooling effect.
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