What temperature does everyone keep there tank at?
 

Also how much can the temperature in the tank fluctuate before I should be worried? Mine seems to vary during the day

I aim for 78°, it dips as low at 77.5 overnight and as high as 79 during the day when all the lights are on. I think anything less than a 4° swing is ok.

between 79.5 and 81

I keep my temp at 78.0 F. My lights 3 x 250W will move the temp to approx 79.5. In the summer I use a chiller to keep the temp within a max of 80.5F

Tom R

I go anywhere between 78-83, or at least I did in my old place.

Thermometer reads about 78-80F all day.

80 at night and up to 84 during the day

78

79-83

78 - 84ish