pH Fluctuation

[walloutlet]

Been working very hard the past month or more to really get a handle of pH stabilization. Looked at different methods using my controller, kalk and lighting. This got me to thinking, what 'really' is fluctuation?

Too me I like to work with very tight tolerances but I am curious to see what everyone else operates like.

So, how much does your pH value change throughout the day. Mostly interested in the swing between night time (display tank lights off) and day time (display tank lights on).

For example, at the lowest point during the night my tank will bottom out at 8.20 and then during the day tops out at 8.34. So that would be a variance of 0.14.

Change ranges:
0.00 - 0.05
0.06 - 0.10
0.11 - 0.15
0.16 - 0.20
> 0.21