That's higher than any recommendation I've ever seen, even for Discus at the 93F end. Many plant shops offer Discus tank selections, but I've only ever seen 86F as the upper recommended limit.
My 90 gallon went into a mid-90F death spiral and pretty much every plant died or suffered mightily. Add a fan across the surface, run the lights at night when the house is cooler, shorten the photoperiod and/or reduce the amount of lights to cool things off. I added a radiator and reduced the amount of lights, so now it stays in the 74-80F range.
I'd really like to keep a couple of big fat fancy goldfish in that tank, but they prefer around 68F and I can't get there without a chiller. I refuse to go that route, but I'm testing it out with a smaller less fancy goldfish.
Raditors use a simple evaporative cooling, not sure why they are not more popular for aquariums, but the chillers are well established and no one really has done much with them. Swamp coolers work well is some locations where the humidity is lower also.
Just think about a car radiator....hot water comes in, air movement, cooler water returns. A fan across the top of the surface will help and is essentially a fan swamp cooler.
My 110 watt AHS lights on a 29 gallon tank were heating the water to 85 F so I installed a 40 mm diameter 12 volt fan in the end of the canopy, blowing into the canopy, with air exhausting out the vent holes on top and in back. I run it at about 6 volts, and the temperature now tops out at about 76 F. That's a very small fan too. I am evaporating some water, but it is well worth it.
The original question hasn't been answered though. I am interested as well in the point of the question which is: can a planted tank be maintained at discus temps in the neighborhood of 85F without negative repercussions, or are temps in the mid 70's really better for the plants.