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Old Yesterday, 05:41 PM   #1
HarrisonMG
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Join Date: Mar 2018
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Alkalinity goes...up?

I mix all my water with ReefCrystals
And that gives the water an alk of about 11 dkh.
So that's fine and all, but in my quarantine, the water rose from 11dkh to 15dkh in just a couple of days--and without me doing a thing.

This killed my entire 8" Monti, plus a green trumpet.

Last week, the water in my DT was about 8.5dkh. Now, again, without doing anything, even a water change, it's up to 10dkh.

Can anyone explain this to me? When I went to my LFS, they said that alk should naturally go down over time!


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Old Yesterday, 06:11 PM   #2
bertoni
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Alkalinity won't rise unless something is added to the water column. pH buffers and tap water are typical stealth sources of alkalinity. 15 dKH shouldn't kill corals that quickly, not without something else happening. That seems strange.


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Old Yesterday, 06:13 PM   #3
ramseynb
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Or water evaporation. If you're allowing water to evaporate and not replacing it with fresh water, I could see those levels rising. Is your salinity rising as well?


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Old Yesterday, 06:17 PM   #4
HarrisonMG
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Quote:
Originally Posted by bertoni View Post
Alkalinity won't rise unless something is added to the water column. pH buffers and tap water are typical stealth sources of alkalinity. 15 dKH shouldn't kill corals that quickly, not without something else happening. That seems strange.
I added nothing, I swear! (Except food I guess...)

I have a whole other thread about my Monti:
http://www.reefcentral.com/forums/sh...1&goto=newpost

As for water evaporation, I have a tight fitting lid so very little escapes and the amount that does, I do replace with freshwater.


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Old Yesterday, 06:31 PM   #5
bertoni
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I'd guess that you're seeing a measurement problem, then, unless there's some alkalinity in the food, which seems unlikely. I would look for other causes for the coral death, in any case, since 15 dKH seems safe enough on average. That might not hold for tanks with some sort of carbon dosing or other nutrient reduction, but the coral decline seems very rapid, from what you have said.


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Old Yesterday, 07:19 PM   #6
HarrisonMG
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I have tested many times and with multiple test kits, Api and Salifert.
Now QT is down to 13


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Old Yesterday, 10:58 PM   #7
bertoni
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Have you checked the pH? If the lid is very tight-fitting, that might limit air circulation, which might cause some testing issue, although I'm skeptical about that.

Something needs to dissolve into the water to increase the alkalinity. What is in the tank?


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Old Today, 01:37 AM   #8
Tripod1404
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I am also inclined to think that it is a measurement error.

Do you get any precipitation or have any type of substrate or rock inside your tank? The only thing I can think of side from measurement error is alk somehow precipitating as calcium carbonate and the redissolving or your substrate/rocks that contains CaCO3 is being dissolved.

But that should not normally happen as alk is calcium carbonate very insoluble in + ~pH 7 and it is very very hard to drop the pH of sea water below that. I doubt it, buy maybe by tight fitting a lid you are causing pH to drop and solubilizing calcium carbonate (if you have any).


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Old Today, 06:39 AM   #9
HarrisonMG
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Lid isn't air tight, just covers most of tank. Probably a 3x12" gap where surface is exposed to air.
Forgot to mention that I measured a few different times and then my LFS measured and got the same result.
Only things in water are plastic decorations from Petco I've had for years, PVC railing, and two Terra Cotta pots. Nothing is falling in.

Ph is good at 8.3


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