How long after water change to test?

Daddyrawg · 06/26/2020, 06:12 PM

I want to see if my mgnesium levels rose after water change..how long do I need to wait to test for change?

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ichthyogeek · 06/26/2020, 09:20 PM

Could use a second opinion on this, but I think as long as the tank has mixed thoroughly, you can test then. I'm more than willing to bet that it will have mixed by 24 hours post water change. Any sooner than that might be dependent on tank turnover rates I think.

Sk8r · 06/27/2020, 10:11 AM

I wait about 24 hours. These elements interact with each other, and it takes time for the chemistry to settle. Too soon can mislead you. My 24 hours is not graven in stone: it's just that my sump is down in the basement and my tolerance for standing there is not time enough. Give it a fair space.

06/26/2020, 06:12 PM	#1
Daddyrawg Registered Member Join Date: May 2018 Posts: 814	How long after water change to test? I want to see if my mgnesium levels rose after water change..how long do I need to wait to test for change? Sent from my SM-G973U using Tapatalk

06/26/2020, 09:20 PM	#2
ichthyogeek Registered Member Join Date: Sep 2014 Location: Arkansas Posts: 742	Could use a second opinion on this, but I think as long as the tank has mixed thoroughly, you can test then. I'm more than willing to bet that it will have mixed by 24 hours post water change. Any sooner than that might be dependent on tank turnover rates I think. __________________ So many fish/corals/inverts to keep/breed, not enough aquaria Back after a 5 year hiatus.

06/27/2020, 10:11 AM	#3
Sk8r RC Mod Join Date: Feb 2006 Location: Spokane WA Posts: 34,628 Blog Entries: 55	I wait about 24 hours. These elements interact with each other, and it takes time for the chemistry to settle. Too soon can mislead you. My 24 hours is not graven in stone: it's just that my sump is down in the basement and my tolerance for standing there is not time enough. Give it a fair space. __________________ Sk8r Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low. Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.