What is considered a large shift in temperature?

[WhiskeyCoffee]

One thing people are always stressing over is maintaining stable parameters in their tank - so specifically with temperature, what is a dangerous shift in degrees and in what time frame?

For instance, over the last few months my average temp has been 75.9° with a variance of .63° - is that significant or would I have to measure the variance in a 24/12/6/3 hr period?

Max temp: 77.6°
Min temp: 74.5°
Median temp: 75.99°
Variance: .63
Standard deviation: .82

 

[Elementalj]

74 seems kind of chilly to me. As for temp swings mine never falls below 77.3 and it's highest is around 79. So small swings shouldn't be too detrimental.

 

[ReeferMaddness843]

I swing 79-81 and all inhabitants happy, fat, and doing well.

 

[cloak]

I've had swings of 4 or 5 degrees within a 12 hour period or so and haven't had any problems either. This would usually only happen in the middle of summer though.

 

[Elementalj]

It's the chilly temps and super warm temps for long periods that usually concern me. I'd keep mine above 76 if possible.

 

[sa6hir]

I keep both display and quarantine at 74. But when I do a large water change (50%) in mine quarantine it drops to 63. No Ill effect on fish. I think because it a temporary drop it doesn't effect anything!