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Old 05-31-2011, 04:14 PM   #1
brock_adams2002
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Testing after water changes?


This might be a stupid question, if so, I am sorry. After you do a water change, how long does take for the water to be accurate again when testing? Or how long, or do you need to wait to test your water after a water change?
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Old 05-31-2011, 05:28 PM   #2
jalexuk
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Wait a day or two after the water change to do a test.
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Old 05-31-2011, 05:49 PM   #3
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Depends on your water flow and turn over. In small tanks it could be as short as an hour or two, in larger tanks it probably should be a little longer. a day is probably more than enough time for any tank to mix properly.
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Old 05-31-2011, 06:02 PM   #4
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Not sure if it is good practice but I never test before a water change, usually test a few hours after (if I even test, sometimes I will limit testing to only salinity).
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Old 06-01-2011, 12:21 AM   #5
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Hmm. My pre-water change test tells me when I need a change.

I guess that's the difference between my practice of "listen to the water, it will tell you when it needs changed" and a scheduled change.

I seem to go about 5 days or so average nowadays, but in recent history I've had them performed twice a week at times.

I suppose when the tank gets to the point where it could technically go a couple weeks without stressful nitrate or phosphate accumulations, I may be able to schedule my changes...

If only...
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Old 06-01-2011, 08:50 AM   #6
brock_adams2002
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I always test before a water change. I was just wondering how long it takes to be accurate again after a water change, just something came to thought last time I was doing one.
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Old 06-01-2011, 09:52 AM   #7
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The only thing I can think of that would make a test read false immediately following a water change would be a lack of time for diffusion (between the new and existing water) to take place.

The one thing in our glass boxes that immediately assists diffusion is flow, so +1 to refhater.

I would add to refhaters comment something seemingly obvious - I would think two tanks of greatly different sizes with equal flow magnitudes would diffuse in a similar time frame. eg: 50 gallon tank with 500gph flow = 300 gallon tank with 3000gph flow.

Sorry I misunderstood the direction of the thread. That's the difference between "late-night Chalk" and "I've-had-some-sleep-and-coffee Chalk"

I have a 75 gallon with 2100 gph flow (not counting what the power filter does) so my water theoretically turns over 27 times per hour. I personally would feel safe testing within an hour, but I generally wait for the next day, or at least 4-6 hours. Not because I'm worried about getting false readings, but because of time constraints.
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Old 06-01-2011, 12:56 PM   #8
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Different strokes for different tanks I guess... I do water changes based on algae growth and how my fish are doing, it ends up coming out to once every 1 to 2 week (i do have a light bioload)
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Old 06-01-2011, 01:50 PM   #9
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Quote:
Originally Posted by Captmrbles View Post
Different strokes for different tanks I guess... I do water changes based on algae growth and how my fish are doing, it ends up coming out to once every 1 to 2 week (i do have a light bioload)
True, there's a lot of that in saltwater, lol.

I'm more concerned with nitrate and phosphate levels than the visual algae. When the algae levels and nutrient levels more closely match each other for my tank, I'll probably adapt a perspective similar to yours.
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