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Old 09/18/2012, 12:00 AM   #1
perrdav
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Potassium and Algae Growth

So I was at my lfs this weekend and we got to talking about green hair algae and he recommended dosing potassium to kill gha. I've never read anything that would indicate that this would help, but I thought I would ask here to see if anyone has any info on this.

I don't test for potassium so I don't want to go dosing anything blindly. And to be honest, it seems like algae might use potassium for growth like other plants, so wouldn't increasing it lead to MORE algae? Thanks.


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Old 09/18/2012, 12:03 AM   #2
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There's about 400 ppm of potassium in saltwater. I have never heard that adding more will discourage algal growth. How much was he talking about dosing?


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Old 09/18/2012, 12:10 AM   #3
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I believe he said up to 700 ppm could be done safely. Unfortunately I didn't have a lot of time to pick his brain on the reasoning behind the increase.


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Old 09/18/2012, 12:45 AM   #4
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I believe adding a salt to aquarium water can kill something in it. When I increased magnesium for the first time a white carpet that growed below a rock disappeared in just one day. It was a little switch (25 mg/liter) but a fast-acting killer.

I donīt know about potassium/green hair algae though.


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Old 09/18/2012, 12:55 AM   #5
bertoni
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Well, it might work. I'm skeptical, though.


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Old 09/18/2012, 03:31 AM   #6
kipper31
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Raise your potassium to 700 ppm and say by ,by corals.Most SPS will RTN.Dont dose unless you can test.I think increased pottasium would lead to more Algea,I'm very surprised a LFS would reconmend raiseing to 700.


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Old 09/18/2012, 04:43 AM   #7
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i think they meant raise your mag, kent tech m seems to work at killing gha when you use it to raise your mag to very high levels


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Old 09/18/2012, 05:40 AM   #8
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The algae scrubber crowd is looking at potassium depletion as a possible cause of diminished algae growth. The thinking is maybe K is a limiting factor, preventing P and N from getting mopped up with algae.

I'd be leary of adding anything above NSW levels.


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Old 09/18/2012, 01:32 PM   #9
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Thanks for the replies. I wasn't planning on dosing anything, but thought I'd ask about it due to curiosity.


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Old 09/18/2012, 05:46 PM   #10
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Maybe he said Magnesium. I keep my levels at around 1500 ppm and I have not had any GHA for 2 yrs. I accidentally increased my levels back then due to a faulty Mg test kit.

I am not as experienced as some here on RC, but am skeptical about K dosing.


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Old 10/18/2017, 02:41 AM   #11
chungsl
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Quote:
Originally Posted by edgey View Post
The algae scrubber crowd is looking at potassium depletion as a possible cause of diminished algae growth. The thinking is maybe K is a limiting factor, preventing P and N from getting mopped up with algae.

I'd be leary of adding anything above NSW levels.
I dose potassium to 430ppm ,i found that less less microalgae is on the tank glass.


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