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Old 10-03-2011, 09:19 PM   #1
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Question Saltwater changes

Ok I am about to do a water change, do I need to test the water I am adding to the tank first or do I add the water and then test the my tank? I let my new water sit next to my tank since yesterday, anything special I need to do?
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Old 10-03-2011, 09:38 PM   #2
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Definitely check your specific gravity. You don't want to turn the tank brackish or into the Dead Sea either. Checking pH is also a good idea in case there's a big swing.

Are you using RODI water? If not, you should to avoid algae problems. It's a good idea every now and again to double check the nitrates and phosphates of the new water to make sure it's clean going in. I'm sure a few folks on the boards can tell you about their RODI filters wearing out and not realizing it until they were seeing problems in the tank.
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Old 10-03-2011, 09:53 PM   #3
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My PH on my new water is at 8.8 a little high how do I bring it down or is it ok to add the water in that way?
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Old 10-08-2011, 03:03 PM   #4
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What does your pH run in your tank?
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Old 10-08-2011, 03:11 PM   #5
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Make sure your SG is correct and that your temp of the water matches.Your PH will be higher in the replacement water because of new water having a better mix of calcium and alk.
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Old 10-08-2011, 05:05 PM   #6
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As above, ensure your temp and salinity are the same, then add away.


Assuming that the source is reliable, of course.


I have done it that way and have had no issues.
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Old 10-08-2011, 05:59 PM   #7
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I would go ahead and add it and then test your tank water.
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