I vote for how often it fluctuates and how much it fluctuates. I know that when I was keeping SPS in my 20g, having the temp go from 78 at 8am to 86 in by 3pm, browns the SPS right out. They says SPS = stability promotes success... and it's true. I think as long as your temp. is constantly changing , you will have stressed out SPS .. now, if it's only fluctuating a degree or two, it's not so much an issue. I know that when I kept my temps from 78-82 things were alright.. decent colour on the SPS and decent growth, nothing to get excited about , but it was working for me.. that was until we got the hot snaps in the summer time.. going from 78 to 86 every day was just bad on everything in my tank..
HTH.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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