My tank being open top and pretty small may help but since adding a4-fan azoo unit my tank stays a rock solid 79 even when the room it is in hits 27C and it has a few times when I forgot to turn the portable AC on or we had 30 people over for a bday.
If I ever need a chiller what i want to do is build a stand up near the ceiling in the basement and plumb thru the floor to it and right back up. All the hot air (and noise) would get exhausted into my basement and not work against the cooling it does.
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