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Old 02-21-2015, 08:38 PM   #1
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pH crash

I've got a 23L edge set up, live rock, a peppermint shrimp and a couple of Halloween Hermits.
Recently I've noticed the pH drop from around 8-8.2 down to 7.6. No ill effects on the inhabitants but I can't understand the crash.

Water I buy is 8.2 and the hob filter provides the oxygenation. I've got a reasonable whack of crushed she'll in there too.

Any ideas on the cause?


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Old 02-22-2015, 08:59 AM   #2
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What time of day did you check it? PH usually fluctuates in a 24 hour period.
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Old 02-22-2015, 02:28 PM   #3
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8pm. But I've checked at various stages over last few days.

Is a fluctuation from 8.2 to 7.6 normal?


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Old 02-23-2015, 02:46 AM   #4
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What is your alkalanity at? Low Alk can cause increased pH swings.
If all is low you can raise it with baking soda.



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Old 02-24-2015, 11:49 AM   #5
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I'll have to check that later.
Odd thing is I use shop water where parameters are fine, so there has to be something with my set up that is causing it to crash.

Ill give the baking soda a go, but I'd rather understand the problem for the long term.

Any ideas?

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Old 02-24-2015, 12:48 PM   #6
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I wouldn't be trusting store water to be fine. Is be testing it as well.


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Old 02-24-2015, 01:31 PM   #7
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Yes. I have been testing store water. That's how I know its fine :p

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Old 02-24-2015, 02:22 PM   #8
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Alkalinity is one of the basic water parameters you should be testing. pH is kinda irreverent, as it does swing throughout the day and night. Alkalinity is also what determines how much or how far the daily pH swings are. Higher Alk means less pH swing. Unfortunately corals absorb that which makes up alk (i.e. carbonates), meaning the pH swings can increase as time goes on.
Having an appropriate pH level (8-12 dKH or about 3-5 meq/l) will bring your pH level up to the range you want (8.2-8.4), so manage the alk and let pH follow on its own.
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Old 04-20-2015, 06:47 AM   #9
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pH crash

I'm fresh out of ideas guys.

Today's test....

Ph: 7:6
Ammonia: 0
Nitrite: 0
Nitrate: 0.5
Alkalinity: 12 (4.3 meq/l)
Salinity: 1.024

I am now a peppermint shrimp less and ph won't budge. Anyone else had a similar problem shifting ph?



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Old 04-20-2015, 10:38 AM   #10
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If it stays there it shouldn't be a problem. Though, a fresh thought...besides a hob what is moving water in the tank?
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