Dosing boric acid - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-16-2006, 08:53 AM Thread Starter
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Dosing boric acid

Hi all,
I have a 63G well planted tank and I'm experiencing some deformation with the new growth leafs. My parameters are kh 6, gh 12, ph 7, light 144W, pressurized Co2. I am fertilizing with Aquamedic Ferreal and Floreal. Because gh is high I doubt there is a problem with calcium, so I focused on boron that could block calcium uptake.
I bought some boric acid that is a powder and my chemistry problem is how much to dose to obtain for example 1 ppm concentration.

Thanks
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post #2 of 7 (permalink) Old 02-16-2006, 12:18 PM
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Not an lot at all. I would merely wet a small piece of wood and pick up a few grains and dissolve them in the tank. You don't need 1 ppm of boron in the tank.

Boron is a TRACE element.
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post #3 of 7 (permalink) Old 02-16-2006, 12:41 PM Thread Starter
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Thanks for replying.
I have another tank of the same size that contains a piece of wood (20cm/10cm).
There is some hygrophila polisperma in that tank that presents the same problem.
So wood contains boron? This could mean that not the boron is my problem.
How much do I really need as concentration (ppm)?
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post #4 of 7 (permalink) Old 02-16-2006, 01:05 PM
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Quote:
Originally Posted by fishtecine
So wood contains boron? This could mean that not the boron is my problem.
I don't think that is what Rex was implying. I think he was just suggesting a method (i.e. the wood) for picking up a few "grains" of the boric substance. Sounds like you might want to go with a pre-mix, though I'd have no clue what ratios of boric to water to use.

I'm very interested in hearing your results however!
Brian.
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post #5 of 7 (permalink) Old 02-16-2006, 07:41 PM
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BSS is correct.

I used the idea of a wet toothpick to pick up a very small amount of the boric acid.

I'm trying to remember how much boric acid I added to the Plantex CSM I sold. I seem to remember it was about 10% by volume. And then you have to figure out the dilution of the Plantex and how much boron is in boric acid. But it's not going to be a lot.

Here is the ratio I used.

Quote:
To add B to CSM to make CSM+B, mix 10.5 teaspoons of CSM to 1 teaspoon of H3BO3 (CSM to H3BO3 is 14 to 1 by weight). (CSM+B has a ratio of 5.5Fe(iron) to 1 B)
Direct from The Krib.
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post #6 of 7 (permalink) Old 02-17-2006, 03:21 AM
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I found this thread: https://www.plantedtank.net/forums/ge...ighlight=H3BO3

Quote:
Originally Posted by otherwise
In the 250 ml bottle, mix 3 teaspoon Plantex CSM and 0.25 teaspoon H3BO3 (Boric acid) with enough water to make a 250ml solution.

Start by dosing 5 ml of the solution to the 120 gallon 2-3 times per week. There isn't a good Fe test kit so monitor by observation. Dose too little and you'll see iron-chlorosis. Dose too much and you'll see thread algae.
My 20 gallon tank has the same problem as yours (with hygrophila polisperma too). Other plants don't have this problem. I started dosing CaSO4.2H2O and MgSO4.7H2O, because I have a very low GH and I noticed only a minor change in plant's health after dosing. So, this week I bought some H3BO3 to see what happens...

Following the above quote, I dissolved 1/4 tsp H3BO3 into 100 ml of water (I know it's more, but I think it's ok since I don't mix it with traces) and I'm dosing 8 drops 3 times per week (~ 1 ml per week). Does anyone know if it's ok, or should I dose more?

Last edited by Frank Drebin; 02-17-2006 at 04:47 PM.
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post #7 of 7 (permalink) Old 02-17-2006, 07:31 AM Thread Starter
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In the most affected tank I run carbon for about 1 month and about 1 week of uv sterilization because I had a bad green water. It seems that one or both affected the nutrient balance. I stopped uv filter 1 week ago.
I know carbon will take out medicines, hard metals from the water, but boron? I know also plants can store much more nutrients than they need. So the deficiency occurred in fact some time ago. Could it be 1 week, more? If the proper balance is achieved, how long it takes to show signs of improvements? Most affected are ammania senegalensis, gracilis and eusteralis stellata.
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