figuring out how much sulfate fertilizer to add?? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-12-2004, 08:09 PM Thread Starter
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fertilizers i have are(dry form):

KNO3 (potassium nitrate)
K2SO4 (potassium sulfate)
KH2PO4 (mono-potassium phosphate)
Mn (Manganese Sulfate)

I figured out by nitrate and phosphate test kits for the KNO3 and KH2PO4

but what do i need to determine the amount of the sulfates i need to add?

I only have a 20 gal tank, the calculator hardly works for my tanks since it only starts at grams, i land up just making the calculator 60 gal and dividing all the measurements by 3.
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post #2 of 6 (permalink) Old 02-12-2004, 08:16 PM Thread Starter
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or how much of eash should i be adding, when i tested my tank, my nitrtates were 0ppm, phosphate 0.1 ppm ph 6.9 kh 13

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post #3 of 6 (permalink) Old 02-12-2004, 09:38 PM
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Ok, you're not dosing sulfate...you're using those to get potassium (form K2SO4) and Magnesium.

You need to add nitrates for sure. phosphates are low too. there are no test kits out there for potassium or magnesium. No clue on dosing Mn, but potassium should be dosed after a water change to about 20ppm.
Use this calculator http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm
It goes down to 20 gallons, but I prefer to download his calculator because it has dry dosing options...not just how to mix stock solutions
http://www.csd.net/~cgadd/aqua/art_plant_aquacalc.htm
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post #4 of 6 (permalink) Old 02-13-2004, 12:56 AM
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Lamotte has a potassium test kit. I use it once in a while. It works pretty good. It is tough to read but it does give you the ballpark.

Ken
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post #5 of 6 (permalink) Old 02-13-2004, 12:59 AM
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He said he had Manganese not Magnesium. But I would guess he really has Magnesium.
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post #6 of 6 (permalink) Old 02-13-2004, 09:13 PM
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Yeah, I figured LaMotte had one, but I'm not interested in a $60 test kit.

And Rex...yep I know he put manganese, but I too assumed he meant magnesium (just because I'm used to using Chuck's calculator)
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