KNO3 foaming surface - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 01-20-2014, 06:34 PM Thread Starter
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KNO3 foaming surface

Hey everyone,

As the tittle states, I'm having an issue with foaming in the surface of my low tech 40B tank. I dose dry ferts by EI.
I recently decided to add an air stone and noticed foaming immediately. I thought it would've went away on its own after a few days, but it didn't.
So I decided to investigate. I did a ~40% water change to begin. Added treated water and it seemed to have reduced a little.
Now came time to dose. I decided to premix each dry fertilizer in a container with aquarium water individually before adding to the aquarium. I mixed KH2PO4 by using the excessive shaking method, no foaming- Added to the aquarium. Did it for the K2SO4, no problem. Did it for the KNO3, foamed pretty good in the mixing container. I got a little suspicious. Added to the aquarium, it now began to foam more again.
I purchased the dry ferts from a reputable seller.

Is this normal? Has anyone had similar issues?








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post #2 of 15 (permalink) Old 01-20-2014, 06:40 PM
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I get something similar, not so foamy, but it isn't just limited to KNO3, but also KH2PO4. I don't know why that is, though.
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post #3 of 15 (permalink) Old 01-20-2014, 08:41 PM Thread Starter
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I don't like this
It has now taken over the entire water surface



Any ideas out there?


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post #4 of 15 (permalink) Old 01-20-2014, 09:12 PM
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You know what I think it is? I think it's just O2 bubbles from the algae! That's why it forms right after it's added to the tank.
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post #5 of 15 (permalink) Old 01-20-2014, 09:23 PM Thread Starter
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I apologize but I'm not sure I know what you mean.
There is no bubble at the surface if I don't run an air stone.
The bubbles are from the air stone. I've never had foam form at the water surface from an air stone.


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post #6 of 15 (permalink) Old 01-20-2014, 09:37 PM
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How many bubbles are you pushing out of the air stone? Maybe just turn down the amount of air coming from the pump. I dose EI and have an air stone at night but I've never experienced what you picture shows.

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post #7 of 15 (permalink) Old 01-20-2014, 09:43 PM Thread Starter
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I'm not pushing out too many, I turned down the amount of air to the stone.
I "popped" most of the bubble and turned the output more towards the surface. Seems to be helping keeping it under control but the bubble are still being produced.










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post #8 of 15 (permalink) Old 01-20-2014, 09:45 PM
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I think the algae is forming a layer at the surface and trapping the bubbles.
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post #9 of 15 (permalink) Old 01-20-2014, 10:04 PM Thread Starter
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I have amazon frogbit,duckweed,savinia minima,and a few stems of hygroryza aristata as floaters


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post #10 of 15 (permalink) Old 01-20-2014, 11:57 PM
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IMO that is still too many bubbles. What kind of filter do you use? Do you have surface agitation from your filter? If so, you shouldn't need all that oxygen.

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post #11 of 15 (permalink) Old 01-21-2014, 12:08 AM
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I get this from time to time. Just net the surface with a brine shrimp net to remove it and get better surface water movement. No big deal.

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post #12 of 15 (permalink) Old 01-21-2014, 01:38 AM Thread Starter
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I use Fluval 306. I have plenty of surface agitation but recently changed the output nozzle to something with less pressure so my floating plants didn't get sucked down and blown all over the place.

Dempsey, do you have any idea to what causes it in your tank?


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post #13 of 15 (permalink) Old 01-21-2014, 06:38 AM
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Increased biofilm caused by the addition of K+ to the system most likely. NO3 wouldn't have that effect. The bloom will stabilize in a week or two.

First time adding ferts?
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post #14 of 15 (permalink) Old 01-21-2014, 06:58 AM
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Even adding Fe causes the surface to collect gas bubbles.
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post #15 of 15 (permalink) Old 01-21-2014, 11:24 AM Thread Starter
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Quote:
Originally Posted by Positron View Post
Increased biofilm caused by the addition of K+ to the system most likely. NO3 wouldn't have that effect. The bloom will stabilize in a week or two.

First time adding ferts?
Just started adding ferts about a month ago but I wasn't running an air stone. I noticed an increase in biofilm at the surface but figured it was just protein.
Nevertheless, I tested with each fert individually, including K2SO4 with no foaming at all. The only fert to give me the foaming was KNO3. I understand that is contains potassium in it, but so does KH2PO4 and K2SO4 which gave me no foaming.
It doesn't seem to be causing any distress in the tank, which I didn't expect it to, so I will just keep an eye on it I guess.

Quote:
Even adding Fe causes the surface to collect gas bubbles.
I wasn't aware of that, thank you for your input. I normally don't run air stone but instead rely on surface agitation. If it is bubbling this much with the addition of an air stone, this leads me to believe that surface agitation has been somewhat useless unless I was to have to the point of splashing. Just a thought.
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