How to get low Ph - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 10-12-2014, 02:31 PM Thread Starter
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How to get low Ph

Hi,

I'm trying to get pH around 4-5.5 to breed Ivanacara Adoketa, but for the moment i'm not able to have below 6. I used 100% reverse osmose water with catapa leaf.

Do you think the ADA black water is a good product to get the ph below 6 ?

I'm not able to find aulne fruit. Today, i will try to add some coco nuts to the tank.

Internet said to have "Amtra oak leave extract" (not available in america).

I dont want use chimic acid.

Have you some tips to get these values ?

Thank
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post #2 of 9 (permalink) Old 10-12-2014, 02:49 PM
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Bog peet??
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post #3 of 9 (permalink) Old 10-12-2014, 03:41 PM
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Try all the organic options you can, but if it still won't drop, then add acid.

Check that the water you are using has no carbonates. If the RO is allowing any carbonates through, then you won't get the pH that low.
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post #4 of 9 (permalink) Old 10-12-2014, 04:52 PM Thread Starter
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I check my RO.

Gh kh are at 0 and ph at 6.

I try peet moss a time, but it reduce the filtration in the filter. Maybe i can try to put directly in the tank with a bag.
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post #5 of 9 (permalink) Old 10-12-2014, 06:42 PM
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If you really do have zero KH your pH will not be very stable. Any organic acid that shows up in the tank, from peat, for example, will lower the tank water pH by an amount that will not be stable. You need the buffer that consists of a KH value above zero, and the CO2 that dissolves in the tank water from the air. That will then determine the tank water pH, but will almost certainly be above pH 5. I doubt that you can succeed at maintaining a stable lower pH in the tank water.

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post #6 of 9 (permalink) Old 10-13-2014, 08:37 PM
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Smile How Are You Measuring pH?

Hi,

Just making sure, you are getting the pH 6.0 reading after adding T. catappa.

If not:
First check your method of checking pH or your RO filter the water should be right around pH 7.0 at 25C (77F), temperature is the only thing that will affect the pH of pure water. (For the record the disassociation constant remains the same even after adding “stuff.”)
  • At 20C (68F), pure water will be pH 7.08.
  • At 30C (86F), pure water will be pH 6.92.
  • For pure water, the range is pH 7.47 to pH 6.14 (just about to freeze to just about to boil).

You will add something the water to get to pH 4.5 to pH 5.5. You can pretend you are not adding “chemic acid” when you add T. catappa leaves, but you are adding tannins and humic acid.

Are you using the dried leaves or an extract?

You may simply need to wait or increase the amount of T. catappa. If you are using the leaves you may wish to make your own extract, a version of “blackwater extract,” perhaps adding in peat moss (Sphagnum spp.).

Even though it will tend to resist lowering the pH, I recommend adding 8-20-ppm KH (.5-1-dKH) for stability.

I also recommend staying above pH 5, closer to pH 5.4 for stability.

Good luck!

Respectfully,
Joe
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Last edited by JoeRoun; 10-13-2014 at 08:37 PM. Reason: a not e
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post #7 of 9 (permalink) Old 10-17-2014, 12:07 AM Thread Starter
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Hi,

I add dried catapa leave, i have 10 leave in 20G.

How many leave i need to do my own backwater extract, more than 100+ in 5G bucket ?

Yes, i add 1 dkh solution to my RO water. Are you sure about the ph of RO, when i test it, it was at 6.

I see on internet, many Europeen use "Amtra echenextrakt". It cost 65$ ship to quebec a 1000ml solution.
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post #8 of 9 (permalink) Old 10-17-2014, 12:15 AM
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Bogwood and peat will help lower it.
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post #9 of 9 (permalink) Old 10-17-2014, 12:59 AM
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Try a test with RO without the carbonates added.
a) see how low pH you can get.
b) see how stable it is, for how long.

Many of my tanks have the KH removed by the substrate, and they are stable. pH is about 5.8, with peat moss in the filter.
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