Small rock raising PH? Mistaken Ohko - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 02-01-2018, 06:21 PM Thread Starter
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Small rock raising PH? Mistaken Ohko

So I bought 20lbs of Ohko rock from my LFS, and during my cycle my PH was around 6 to 6.2 (buffering soil) but after the tank cycled and "stable" I noticed my PH raising to around 6.4 to 6.5.

After searching and racking my head, I noticed a 1.5 inch piece of "ohko" stone in the tank that didn't look like ohko, so I tested it with vinegar and saw a stream of bubbles.

Could this small piece of rock raise my PH from 6.2 to 6.5?

This is a 17 gallon tank
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post #2 of 9 (permalink) Old 02-01-2018, 06:53 PM
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I would say that little rock was probably the cause.

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post #3 of 9 (permalink) Old 02-01-2018, 08:02 PM
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A volume of calcium carbonate 1/10 that size can push the PH from 6 to 7. I would recommend testing the rest of the Ohko rock to insure you don't have any more pieces.
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post #4 of 9 (permalink) Old 02-01-2018, 08:08 PM
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Ohko stone is a sedimentary mud rock as far as I know, in my testing it always bubbles but not sure it's a carbonate.
I'd expect your pH is just from the buffering soil losing capacity after water changes etc.
Compare the KH in the tank to tap water and let us know what you find.


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post #5 of 9 (permalink) Old 02-01-2018, 09:05 PM Thread Starter
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Quote:
Originally Posted by Surf View Post
A volume of calcium carbonate 1/10 that size can push the PH from 6 to 7. I would recommend testing the rest of the Ohko rock to insure you don't have any more pieces.
I don't think it was actual ohko stone, maybe just mixed in the pile when I purchased it. Imma take out some random pieces of rock in the tank and test to see.

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Originally Posted by Chlorophile View Post
Ohko stone is a sedimentary mud rock as far as I know, in my testing it always bubbles but not sure it's a carbonate.
I'd expect your pH is just from the buffering soil losing capacity after water changes etc.
Compare the KH in the tank to tap water and let us know what you find.
Soil shouldn't be losing it capacity, this tank was set up about 5 ish weeks ago. Soil should still be pretty brand new.

Also, this tank uses RODI water only, nothing else. I remineralize the water with Salty shrimp GH+.


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post #6 of 9 (permalink) Old 02-01-2018, 10:05 PM
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Quote:
Originally Posted by Surf View Post
A volume of calcium carbonate 1/10 that size can push the PH from 6 to 7. I would recommend testing the rest of the Ohko rock to insure you don't have any more pieces.
I don't think it was actual ohko stone, maybe just mixed in the pile when I purchased it. Imma take out some random pieces of rock in the tank and test to see.

Bump:
Quote:
Originally Posted by Chlorophile View Post
Ohko stone is a sedimentary mud rock as far as I know, in my testing it always bubbles but not sure it's a carbonate.
I'd expect your pH is just from the buffering soil losing capacity after water changes etc.
Compare the KH in the tank to tap water and let us know what you find.
Soil shouldn't be losing it capacity, this tank was set up about 5 ish weeks ago. Soil should still be pretty brand new.

Also, this tank uses RODI water only, nothing else. I remineralize the water with Salty shrimp GH+.
So your tank should have a KH of 1 if you follow the directions for that product.. have tested what it is in actuality?

What size tank how deep is the substrate how many water changes have you done..
That amount of pH rise seems low for there to be carbonate Rock in the tank.

Is there co2 injection?
Kh1 at atmospheric co2 levels is a 7 ph, but then you have humic acid presumably. What brand soil?


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post #7 of 9 (permalink) Old 02-01-2018, 11:31 PM Thread Starter
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KH should be at either 0-1 (1 drop immediately turns). Tank is about 17 gallons, with a 2 inch substrate. There is zero Co2 injected, but has a lot of plants (moss, repens, etc). Soil is SL Aqua Nature soil.


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post #8 of 9 (permalink) Old 02-01-2018, 11:41 PM
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Originally Posted by Dragonxflare View Post
KH should be at either 0-1 (1 drop immediately turns). Tank is about 17 gallons, with a 2 inch substrate. There is zero Co2 injected, but has a lot of plants (moss, repens, etc). Soil is SL Aqua Nature soil.
Still curious if you've actually tested the KH in the tank, if it's higher than you've set it to then you have your answer! If it's not higher then it's just the humate and fulvic acids most soils have slowly fading.
With aquasoil for example the water will be darker at first with humic acid, as that is removed the pH will climb closer to the assumed level based solely on KH and co2 levels.
Obviously there is a very high concentration at the beginning of any new tank so I don't think it's odd your pH climbed after 5 weeks.


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post #9 of 9 (permalink) Old 02-02-2018, 01:12 AM Thread Starter
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Tested the KH again just now, it's still 1 drop.

I suppose it's just stabilizing, and that a .2 to .4 reading vs what it is advertised isn't a huge deal. SL advertises that it will buffer to 5.8 to 6.1... since i reading about 6.5 ish, it prob isnt a huge problem


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