I've got my heater set at 78, and it swings between 80 and 77. In the past, I've turned it up a bit in the summer because my AC wasn't able to keep up. It's not the higher or lower temps that stress a tank, it's the swinging of the temp that causes the stress.

Mine is at 80 .. with the heater coming on at 79 and the fan coming on at 81

bounces between 80 and 81

mines stay around 77 -79

Heaters are set at 76

Ranges between 76.0 and 77.5

The heaters come on at 78 and they get up to 82 during the day (84/86 in the summer)

78 to 80

75 never really goes above maybe 75.4 or so down to 74.8.

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77.5 to 81.1 are my ranges depending on the ambiant temperature in the room. I never let it drop below 77.5 though.

almost always 75-77, depends again how long I run my lights