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Should I take water from the top or bottom/medium for testing?


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1 hour ago, BigRedd said:

I've always taken water from the top for testing, but does it matter if you take from the top or bottom of the aquarium in a 75 Gallon? 

My water test samples are taken from the moving water output of the HOB filters.  I have experimented though by "capturing" water from different portions of the aquariums & personally seen very little difference, with my liquid test results.  I.E. pH, nitrite, nitrate, GH, KH, etc...  

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