vancat

84 (altums)
78 (tetras & apistos)

Zapins

83F for the discus tank,
81F for the angel tank, and then
78 for another angel tank/community tank, then
room temp for 2 of my 10g's and about
76 for another of my 10g's

Minsc

76 fall through spring
I try to keep it from going over 82 in the summer.

Astral

I put my tank in at 78. I would have picked 77 but my thermometer goes up by 2's

tfmcder

20G mess of a tank-80F
30G true planted-78F
.5G nano-room (70F)

LIONHEAD

80 degrees, soon to be a discus tank

c4cache

looks like about average.

ecotanker

80F to higher than 86F in my 20 gal High, my other tanks don't have any thermometer.

hoppycalif

I use a small 50 watt heater in a 45 gallon tank. I prefer to use undersized heaters so if the thermostat fails the heater can't do much harm. So, my thermostat is set at about 79 F, but if it gets too cool at night the heater just keeps the temperature from dropping too far, and by the end of the day it is back at 79 degrees. On normal days and nights the little heater keeps the temperature pretty constant.

Shaggathai

84 for my discus tank
82 for community tank
82 for ram tank
78-80 for endler/shrimp tank
65-75 for killie tanks (a few are heated to 75, rest vary by room temp and tank placement).