Question regarding making fert solution - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 08-26-2014, 02:56 PM Thread Starter
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Question regarding making fert solution

I am looking to make a solution for my wife to use when I am away. Dry ferts I have are: kno3, k2so4, kh2po4, csm+b. I will be making a separate macro and micro solution, possible two different macros if necessary.
I usually do not dose kno3 because my tank is sufficiently stocked to keep nitrates unlimiting, but according to the calculator kno3 provides almost 5ppm of the desired 7.5ppm target of potassium that I am aiming for. Now I am not looking to debate target numbers or where I want to be ppm wise. (I will determine levels I want to be at during the time of mixing, just looking for this info before I start the math) What I am asking is can I safely increase k2so4 to make up for not using kno3. I know potassium is not dangerous for fish but it is the sulfate I am worried about reaching dangerous levels. Thanks for any help.

If in doubt, add more plants!

My not-enough-plants-but-not-enough-space-to-put-anymore-so-will-start-going-up-box-of-water.

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post #2 of 5 (permalink) Old 08-26-2014, 03:03 PM
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Yes. You can use K2SO4 to supply all of your potassium without any issues.
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post #3 of 5 (permalink) Old 08-26-2014, 03:15 PM Thread Starter
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Thank you very much zorfox.

If in doubt, add more plants!

My not-enough-plants-but-not-enough-space-to-put-anymore-so-will-start-going-up-box-of-water.

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post #4 of 5 (permalink) Old 08-27-2014, 02:41 AM
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Yes. The dose is not exactly the same, but it is the easiest to remember: You can dose either or both, and swap them in equal amounts.

So, if the recipe says to dose 1 teaspoon of KNO3, but you do not want that much NO3, you could dose any combination of K2SO4 and KNO3 to total 1 teaspoon.
zero KNO3 + 1 tsp K2SO4
1/4 tsp KNO3 + 3/4 tsp K2SO4
1/2 tsp each

and so on.
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post #5 of 5 (permalink) Old 08-27-2014, 12:10 PM Thread Starter
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Thank you Diane. That was my next research. Since my nitrate has been stabling and even dropping somewhat I wanted to start using small amounts on kno3 to ensure I did not limit myself there because my plant mass is increasing significantly.

If in doubt, add more plants!

My not-enough-plants-but-not-enough-space-to-put-anymore-so-will-start-going-up-box-of-water.

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