why wont my ph go down - The Planted Tank Forum
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post #1 of 30 (permalink) Old 08-24-2015, 04:56 PM Thread Starter
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why wont my ph go down

water is 3kh and its almost black from the tannins ive added yet the ph is still reading over 7.5. what is going on? too high of kh?
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post #2 of 30 (permalink) Old 08-24-2015, 05:50 PM Thread Starter
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why wont my ph go down

the tank is almost black from all the tannins and still wont drop under 7.5, the kh is 3, do I have too much kh? all the rocks in the tank are granite and the sand is petco black aquarium sand, I have quite a bit of driftwood in the tank and snail shells littered along the tank floor from my assassins. any ideas what could be the problem.
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post #3 of 30 (permalink) Old 08-24-2015, 05:59 PM
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Not entirely sure, but I think granite might raise the pH, but I'm not certain of that.

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post #4 of 30 (permalink) Old 08-24-2015, 06:22 PM Thread Starter
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yea I have heard they raise the ph and ive heard they are inert, ive also heard they act as a buffer. my small knowledge of granite is that they are mostly quartz which is inert and small pieces of feldspar (black specks on the rock) which is supposed to also be inert. other than that they should only have trace minerals. I did the vinegar test and they didn't fizz. could seashells or snail shells raise the ph?

also just remembered there are hard water stains I couldnt remove on the inside of the tank rim just under the water level, could that be enough to counter the almond leaves?
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post #5 of 30 (permalink) Old 08-24-2015, 06:29 PM
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What is wrong with a 7.5 pH? About the only time to be concerned with pH is when you are acclimating new fish to your water. Once they are acclimated, there aren't many species which won't do fine in a wide range of pH readings.

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post #6 of 30 (permalink) Old 08-24-2015, 07:01 PM Thread Starter
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7.5 is the highest the test reads, chances are my water is higher and I have south american fish.
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post #7 of 30 (permalink) Old 08-24-2015, 07:41 PM
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What's your tap water?
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post #8 of 30 (permalink) Old 08-24-2015, 07:51 PM
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Originally Posted by Ras View Post
yea I have heard they raise the ph and ive heard they are inert, ive also heard they act as a buffer. my small knowledge of granite is that they are mostly quartz which is inert and small pieces of feldspar (black specks on the rock) which is supposed to also be inert. other than that they should only have trace minerals. I did the vinegar test and they didn't fizz. could seashells or snail shells raise the ph?

also just remembered there are hard water stains I couldnt remove on the inside of the tank rim just under the water level, could that be enough to counter the almond leaves?

Seashells and (dead) snail shells can affect the gH, not sure about the kH though.

I'll ask the same question as mistergreen did, what are the values of your tap waters kH, gH & pH?


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post #9 of 30 (permalink) Old 08-24-2015, 08:18 PM Thread Starter
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Originally Posted by FatherLandDescendant View Post
Seashells and (dead) snail shells can affect the gH, not sure about the kH though.

I'll ask the same question as mistergreen did, what are the values of your tap waters kH, gH & pH?
way too damn high, I am not sure on specifics but its very hard, I use RO water in the tank, 4gallons of RO- 1 gallon of tap water is the ratio I use which gives me 3kh and about 4 gh. Ill get specifics on the tap in a bit
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post #10 of 30 (permalink) Old 08-24-2015, 11:00 PM
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The easiest solution is more RO and less tap. The tannic acid is neutralized by your tap so you probably won't see any change.
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post #11 of 30 (permalink) Old 08-25-2015, 01:32 AM
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The local water company may be adding something to the water to keep the pH up. I also have GH and KH around 4 degrees, but the pH is in the upper 7s to low 8s. One neighbor tested his pH and it was 9. I called the water company, and they are adding sodium hydroxide.

Call your water company and ask.

If you can get the GH in the right range for the fish they ought to do just fine, even if the pH is a bit high.
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post #12 of 30 (permalink) Old 08-25-2015, 01:33 AM Thread Starter
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what would that even be, pure RO water? is the ratio I am doing now too high in kh (3kh)?because I have been advised against pure ro because of possible ph swings. but if my ratio of tap-RO which is giving me 3kh is still too high I could try more ro.
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post #13 of 30 (permalink) Old 08-25-2015, 01:40 AM
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post #14 of 30 (permalink) Old 08-25-2015, 02:33 AM Thread Starter
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sorry but the link isn't working, I am not sure what type of water system. would I be better off just adding something to give my RO water a kh level, like baking soda or something.
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post #15 of 30 (permalink) Old 08-25-2015, 04:28 AM
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sorry but the link isn't working, I am not sure what type of water system. would I be better off just adding something to give my RO water a kh level, like baking soda or something.
Sure, and a little gh booster too.


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