Temperature fluctuation for SPS

This is probably my 10th new setup in my 25 years of keeping saltwater tanks but I'm hoping to focus more on SPS with this one.
I bought an Eheim Climacontrol unit and have noticed that the temperature fluctuates by a degree around every 2-3 hours during the day.
I'm wondering what affect this will have on SPS.
My concern is that there are occasions when the 1 degree rise will only take about 90 minutes. Not sure if adding a supplementary heater will assist, or if it's even required?
On a side note, I have the Climacontrol set to 25 degrees but the Apex reads 25.8, not sure which is accurate?
I'd appreciate any advice anyone can offer here.

Paul
 

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