Potassium Question - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 03-09-2007, 07:26 PM Thread Starter
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Potassium Question

I have determined that the limiting factor in my nutrition program is a lack of potassium. I came to this conclusion when leaves started to turn yellow and develop huge gaping holes. I even checked to make sure there weren't any snails or other invasive species in my tank.

The question is if I start dosing more potassium what would be a relatively safe ppm level with 3 watts per gallon and a moderately heavy plant load?

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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post #2 of 15 (permalink) Old 03-09-2007, 07:34 PM
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I think your lacking iron not potassium.
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post #3 of 15 (permalink) Old 03-09-2007, 09:38 PM
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I thought lacking potassium yellow leaves as well.

FUNction over form
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post #4 of 15 (permalink) Old 03-09-2007, 09:48 PM
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Quote:
Originally Posted by Finch_man View Post
I think your lacking iron not potassium.
Quote:
I thought lacking potassium yellow leaves as well
you're both right

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post #5 of 15 (permalink) Old 03-09-2007, 10:32 PM
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As for the OP's question, potassium is relatively harmless, but initially I'd try dosing the equivelant ppm of it as you are NO3 in your tank. So if you're dosing 7ppm on NO3 3x a week I'd dose 7ppm of potassium, too.

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post #6 of 15 (permalink) Old 03-10-2007, 04:56 AM Thread Starter
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I have a trace element mix. CSM+B and I add about a half a gram a week to my tank? what else can I do to add iron?

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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post #7 of 15 (permalink) Old 03-10-2007, 05:48 AM
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Seachem flourish Iron.

FUNction over form
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post #8 of 15 (permalink) Old 03-10-2007, 07:29 AM Thread Starter
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easy enough but is there a more cost effective solution than seachem iron?

I found the iron chelate 10% on greg watson's site but dose any body have a dosing equation or advice for using it?

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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post #9 of 15 (permalink) Old 03-10-2007, 08:26 PM
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Do you add NO3 to your tank?
Potassium Nitrate(KNO3) is generally used as NO3 supplement but it also supplies enough K.

50g Tank Fluorite , Pressurized CO2 with Hagen ladder, Fluval 304, 110watts PC 6500K + 60watts Corallife Trichromatic
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post #10 of 15 (permalink) Old 03-11-2007, 12:05 AM Thread Starter
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yeah that's because it's KNO3. I don't use that because I have enough Nitrate in the tank that's why I add Potassium Sulfate (K2SO4)

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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post #11 of 15 (permalink) Old 03-11-2007, 04:36 AM
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Quote:
Originally Posted by mpb View Post
Do you add NO3 to your tank?
Potassium Nitrate(KNO3) is generally used as NO3 supplement but it also supplies enough K.
i was told told it was not enought K in KNO3...

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post #12 of 15 (permalink) Old 03-11-2007, 04:49 AM
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KNO3 has equal parts potassium and nitrate.
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post #13 of 15 (permalink) Old 03-11-2007, 04:58 AM Thread Starter
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confuted I thing someone may have misled you.... Here's why:

5g's of KNO3 in a 55 gallon aquarium will result in:
-14.74 ppm Nitrate and
-9.3 ppm Potassium


Go here and you'll be able to punch in the numbers for yourself.

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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post #14 of 15 (permalink) Old 03-11-2007, 06:25 AM
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Before concluding that your plant problems are due to insufficient potassium, which isn't likely, I suggest you make sure you are dosing an adequate amount of nitrates, preferably KNO3, phosphates, preferably KH2PO4, and CO2, preferably using a drop checker to be sure you have 30 ppm or so, plus make sure your water has sufficient GH, with magnesium as a component of the GH. (Your water company water quality report should answer the last question).

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post #15 of 15 (permalink) Old 03-11-2007, 08:43 AM Thread Starter
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That is indeed a good idea. I figure it has to be some deficiency of some sort or a GH/KH problem because after I moved I kept the ph the same and dosing too so I am pretty sure that the tap water chemistry is different in my new place.

----------------Current Equipment-------------------
80 Gallons
Fluval FX5
4x 65w Power Compact by Odyssea
2x 200 Watt Submersible Heaters
900w UPS
Greg Watson Ferts
15 ml. Flourish Excel daily (keeps BBA away)
25 lb. Pressurized CO2
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