I find cooler temps slows growth a bit, keeps O2 higher and slows waste breakdown. I think I also read somewhere that reef temps are around that.
I used to run a 150g at 82, and it would climb to 90 some days in the summer. Corals browned out a lot, but grew like dandelions. I had to trim monthly and give away coolers of frags.
This tank I decided to run cooler, and it's the nicest I've had in 12 years. That's not all temp related, but I believe that helps.
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Brad
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