POTASSIUM DOSING?? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-23-2004, 01:15 AM Thread Starter
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hey all,

quick question about dosing K. i use chuck's planted aquarium dosing calculator, very useful if you dont use it. he suggests you dose K to 20ppm every week. i am wondering if the consensus out there is to dose K to the full tank volume each week, or if you just dose the amount of water you change each week?

thanks for the input!
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post #2 of 10 (permalink) Old 03-23-2004, 01:25 AM
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I dose to a certain amount, say in your case 20ppm and then dose to replenish what would be removed in a water change in my case 50%...

Do you follow... Dose initially to 20ppm and then dose what every percentage of water you change to get back to that number.


Jason

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post #3 of 10 (permalink) Old 03-23-2004, 01:36 AM
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Quote:
Originally Posted by wellbiz
I dose to a certain amount, say in your case 20ppm and then dose to replenish what would be removed in a water change in my case 50%...

Do you follow... Dose initially to 20ppm and then dose what every percentage of water you change to get back to that number.

Jason
Are you dosing to get just the water added to 20 ppm K or to raise the tank to 20 ppm K? How much N are you dosing for, 5 ppm or 10ppm?

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post #4 of 10 (permalink) Old 03-23-2004, 01:44 AM
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Quote:
Originally Posted by SCMurphy
Quote:
Originally Posted by wellbiz
I dose to a certain amount, say in your case 20ppm and then dose to replenish what would be removed in a water change in my case 50%...

Do you follow... Dose initially to 20ppm and then dose what every percentage of water you change to get back to that number.

Jason
Are you dosing to get just the water added to 20 ppm K or to raise the tank to 20 ppm K? How much N are you dosing for, 5 ppm or 10ppm?
To raise the tank as a total back to that amount,20ppm potassium... As for N I dose dry, @1/2tbs but it really depends on what my tank water tests at...I shoot for 10ppm

Jason.

120g, Flourite & Sand. DIY Stand and Canopy. CF lighting 3wpg, Pressurized C02, DIY reactor. 2-XP3's, 500watt heater.
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post #5 of 10 (permalink) Old 03-23-2004, 02:15 AM
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Starting with no N, if you shoot for 10 ppm N aren't you ending up with 30 ppm K? Do you dose for P?

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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post #6 of 10 (permalink) Old 03-23-2004, 02:24 AM
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Quote:
Originally Posted by SCMurphy
Starting with no N, if you shoot for 10 ppm N aren't you ending up with 30 ppm K? Do you dose for P?
Not to steal Scubas thread, as I have my own going on this issue, but looking at the math you our correct assuming the variable of how much is being used by the plants...... In MY situation this would be true, but I was just making an example for Scuba to go by assuming he isnt adding any other form of postassium like l am...


Thanks
Jason

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post #7 of 10 (permalink) Old 03-23-2004, 02:35 AM Thread Starter
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thanks for the info! i don't dose N, i have a planted discus tank and they take care of the N, and i would like to keep it as low as possible anyway, even if it does limit plant growth. my main concern was having enough K around so that as much N is used up as possible. thanks for the input.
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post #8 of 10 (permalink) Old 03-23-2004, 02:36 AM
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Quote:
Originally Posted by wellbiz
Quote:
Originally Posted by SCMurphy
Starting with no N, if you shoot for 10 ppm N aren't you ending up with 30 ppm K? Do you dose for P?
Not to steal Scubas thread, as I have my own going on this issue, but looking at the math you our correct assuming the variable of how much is being used by the plants...... In MY situation this would be true, but I was just making an example for Scuba to go by assuming he isnt adding any other form of postassium like l am...

Thanks
Jason
Sorry I dragged myself back to that thread. ops:

I think Scuba should test a few times to see how his tank is using the fertilizers and then dose as need after water changes. Since we don't (can't) test K I'd dose to get the K at 10 ppm in the volume of the water changed. It's just too easy to overdose K and the problems it causes are not the same as having an algae bloom from overdosing N or P.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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post #9 of 10 (permalink) Old 03-23-2004, 03:48 AM
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What problems does too much K cause? Are plants unable to take in other nutrients when there is too much K? I'm still getting the hang of this stuff.
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post #10 of 10 (permalink) Old 03-23-2004, 11:47 AM
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People using the fertilizing method that threw in as much K as possible were finding plants showing symptoms of nutrient deficiency. Usually it was a plant like Nesea or Hygrophilia that would have the symptoms of Ca or Mg deficiency. Poor growth in a tank that was growing everything else, small crinkled leaves. Then some people started seeing holes in the leaves. Pinholes in the leaves can be a symptom of K deficiency.

So it is possible that a combination of Ca and Mg deficiency causes a symptom similar to K deficiency except the leaves would rot away. We were going through the idea of reducing the K levels in a tank that had hygro with another guy on this forum. I think it was GulfCoastAquarian but my mind has grown feeble since I turned 40. I am waiting to hear if reducing the K fixed the problem or if I am just wasting bandwidth.

He did post an update in another thread after his CO2 ran out so I am waiting to hear from him again.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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