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#1
06-27-2009, 03:29 PM
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I think sudden swings in pH is what you really need to be concerned about. i.e. calcium reactor pumping excess CO2, or big dump of Kalk. Otherwise your slow pH change over the course of a day is fine. The amount of your "swing" may suggest a reduced buffering capacity of the water. You may want to have a look at your alkalinity just to be sure.
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New!! 150 gal. wt 2 x 250W 10000K MH & 4 T5 Actinics. 
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#2
06-27-2009, 04:07 PM
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7.8 to 8.3 is 100% normal.
But +1 to all the comments. pH of tank water in reef tanks is nearly useless to track. It's a resultant value of other more meaningful numbers. Useful to track in a calcium reactor though, since you want to add enough CO2 to drop the pH in the chambers to 6.7.
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-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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