something is raising the pH in the tank and I dont know why - The Planted Tank Forum
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post #1 of 16 (permalink) Old 05-19-2014, 03:38 AM Thread Starter
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something is raising the pH in the tank and I dont know why

So using API test kits the pH of a stagnant cup of tap water for me is around 6.8. The water in my tank at this moment is about 7.6. I'm trying to get it in the more acidic range for German rams. I did a 60% water change but after an hour or so the pH was the same as before.
Things in my tank:
-Red Sea Flora base substrate
-play sand
-decent amount of plants
-large piece of driftwood
-aquarium safe rocks
-almond catappa leaves

I originally had a handful of crushed coral in my filter and I took those out.
I know the catappa leaves lower pH but I haven't seen much of a difference. I have 4 leaves in there. Does anyone know whats going on?
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post #2 of 16 (permalink) Old 05-19-2014, 04:09 AM
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How big is the tank, and how long ago did you remove the coral from your filter?

How much water did you change?

Have you checked your kH?





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post #3 of 16 (permalink) Old 05-19-2014, 04:26 AM Thread Starter
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Tank is a 25 gallon, i did the 60% water change then realized it might have been the coral so i took it out after. However the water didnt change in pH.
Changed about 15 gallons of water
Kh is 3
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post #4 of 16 (permalink) Old 05-19-2014, 04:28 AM
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Hmmm... something is buffering that pH to raise it that quickly after a 60% water changes.

I'd do a few more big water changes, and if the same thing keeps happening, take a closer look at your rocks?





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post #5 of 16 (permalink) Old 05-19-2014, 04:42 AM
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Substrates?
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post #6 of 16 (permalink) Old 05-19-2014, 08:10 AM Thread Starter
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I did another water change...I'll see what happens.
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post #7 of 16 (permalink) Old 05-19-2014, 10:13 AM
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What are the "aquarium safe rocks"?

Have a gniess day. -Scott

GEOLOGY Rocks Have A Gneiss Day
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post #8 of 16 (permalink) Old 05-19-2014, 02:14 PM
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Put one of the rocks in a glass of water and see what the pH does in that.

Please list all the things you are adding to the water.
Dechlor
Fertilizers?
Other?
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post #9 of 16 (permalink) Old 05-19-2014, 11:50 PM
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Instead of testing your water out of the tap, put some in a glass and let it sit for a day or two and then test it.

I'd give it a couple more water changes after removing the coral, and testing again. If it's still high, look at the rocks, or possibly the play sand.
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post #10 of 16 (permalink) Old 05-20-2014, 04:28 AM Thread Starter
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i'm using Prime as dechlor
I use flourish comp and flourish excel
I've tested my tap water in a cup after 3-4 hours from the faucet and its about 6.8.
Maybe i should test it again after a day?
Anyways, I've done 3 water changes so far and it still seems to revert back to around 7.4-7.5 range but more slowly since the coral has been taken out.
I don't know exactly what the rocks are but I got them directly from a reputable lfs who uses the same rocks in all their aquariums. I trust the store so that's why I say "aquarium safe"...but there's always an uncertainty i guess.
I guess I'll keep doing water changes and test the substrate and rocks if the pH is still going up.
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post #11 of 16 (permalink) Old 05-20-2014, 03:28 PM
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no matter if I use pH decrease by API, my pH is always around 7.6 fwiw, the LFS guy said that's no big deal, that many fish and plants handle 7.6 just fine
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post #12 of 16 (permalink) Old 05-20-2014, 09:28 PM
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It might take a few water changes to get the carbonates down to a lower range. As long as there are noticeable carbonates in your water (dissolved from the coral), they are going to buffer the water, keeping the pH up a bit higher.

Maybe post some pics of your rocks? Just because a rock is sold in a pet store doesn't mean it won't alter pH. A lot of the rocks used in the ADA- style scapes are just really weathered limestone, and those can affect hardness and pH. Also, almost anything used for marine setups is going to be carbonate as well.
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post #13 of 16 (permalink) Old 05-20-2014, 11:11 PM
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are you using carbon? it will raise ph. i have seen it do it in my tanks. also would look at what those rocks do to water. test the rocks in a 5 gallon bucket. see if ph changes


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post #14 of 16 (permalink) Old 05-21-2014, 05:13 AM
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Quote:
Originally Posted by pink4miss View Post
are you using carbon? it will raise ph. i have seen it do it in my tanks.
Whatever brand you were using sounds like one to stay away from. Carbon SHOULDN'T, anyways lol





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post #15 of 16 (permalink) Old 05-21-2014, 09:22 AM Thread Starter
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No I don't use carbon in my filter. i've tested the substrate (play sand) and the rocks that I'm using and they dont do anything to my tap water. But that aside I've seen some improvement to the pH. After 2 water changes I've got it down to 7.3-7.4 and when I test it during the morning its doesn't change. So I'm deducing that it was the coral in my filter and I just have to take out the buffers in my water through more water changes. And if by then the pH doesnt get below 7....goodbye GBR fantasy.
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