testing water?

AZDesertRat

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pH will have the biggest swing according the the time of day and lighting. Everything else should be fairly stable. When I first started out I made it a point to test at various times to gain knowledge about the variations.

If you are looking for consistency test at the same time every day.
 

RBursek

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PH is usually lower in the morning because lights were off during the night. I do mine about 4-5pm. Different times will not affect your other test unless you are dosing more at one time of the day. I do like to be consistent though on the time of day.
 
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