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Discussion Starter · #1 ·
Well I was talking to the nice girl at the lfs today and mentioned that my brown algae is not going away she said its most likely is hi phosphates and to use a phosphate mover or neutralizer. I mention im dose NPK and she said to stop or dose less phosphorus.

So phosphates come from the phosphorus I've been adding. Should I stop all together for say a week or two or just cut my dose in half over the same time frame?
 

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Discussion Starter · #4 ·
2 1/2 to 3 month.
I'll be adding a new filter this week a aqua clear.
I feel the aqueon filter is not really I feel doing its job. Could that be causing or contributing to the algae.
 

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brown algae is actually diatoms. its a bacteria that can photosynthesize.

likely due to lower light levels, or not enough plant growth at this point

as the tank matures diatoms usually go away on their own.. this is usually due to other bacterium growing in the tank doing their job to break things down and keep it clean
 

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Phosphorus is an essential element for all life forms. It is a
mineral nutrient. Orthophosphate is the only form of P that
autotrophs can assimilate. Extracellular enzymes hydrolyze
organic forms of P to phosphate. The effect is studied of
different phosphorous concentration on changes in growth
rate of diatom species isolated from Tones River. All
diatoms examined increasing cell division rate with
increasing phosphorous concentration in the medium.
Diatoms, however, were not able to dominate when
phosphate was deficient, although silicate and nitrate were
in excess.

http://www.ijsr.in/upload/228151688Chapter 21.pdf
 

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Discussion Starter · #7 · (Edited)
So I'm going to stop dose phosphorus for two week and see if it helps and if it helps I'll start dosing again at about half the recomended and slowly raise the dosage over time.
 

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As Wolf said, phosphate alone doesn't cause algae and it very well could be a sign of the newness of the tank.

Limiting a vital nutrient for plants is counter productive. Healthy plants can out-compete algae. Also, even if this somehow did work against your diatoms, you'll just get GSA instead.

Grow plants and stop fighting algae.
 

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So I'm going to stop dose phosphorus for two week and see if it helps and if it helps I'll start dosing again at about half the recomended and slowly raise the dosage over time.
We really do not have enough details to help you based on the information provided.

Light?
Pic of the tank?
Plants? What type, how much, CO2?

Etc...........

Ferts are essential and perhaps the easiest thing in the hobby, but many still have long blamed them for algae and as I often tell folks....."a good myth is very hard to kill".

I dose 10-15 ppm PO4 a week to this tank:



10 ppm to this one:





Algae can be due to many things, but mostly....it's due to folks not addressing the plant needs, which light and CO2 are the dominate issues for 90%(maybe more) of folks having algae issues vs say ferts.
 

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I thought brown diatoms were caused by high silicates. ??

When mine didn't appear be getting any better and in fact seemed to be getting worse even after 3-4 months I finally added PhosZorb to my filter. It made a noticeable difference rather quickly. After several weeks they were gone. I don't know if it was just a coincidence they cleared up when I added the PhosZorb or not, but when they started again after changing my substrate I put the bags back in and they started going away. Again could have been coincidence. But to me it seemed to help. I dose extra Phosphate to put back in what is removed.
 

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I thought brown diatoms were caused by high silicates. ??

When mine didn't appear be getting any better and in fact seemed to be getting worse even after 3-4 months I finally added PhosZorb to my filter. It made a noticeable difference rather quickly. After several weeks they were gone. I don't know if it was just a coincidence they cleared up when I added the PhosZorb or not, but when they started again after changing my substrate I put the bags back in and they started going away. Again could have been coincidence. But to me it seemed to help. I dose extra Phosphate to put back in what is removed.

new substrates usually have lots of silicates. there are a few that don't.. keep that in mind as well.
 

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I’ve been reading about how carbon is the limiting factor for bacteria. The thesis is that with more carbon available the bacteria will out compete the algae, thereby repressing the algae grow.

I see this all the time that adding more Phosphate I get more algae. I don’t see that as mythological at all. Of course I am not adding any co2 or any excel. Recently I have been increasing the K and not dosing any P and I seem to be getting rid of more algae.
 

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I’ve been reading about how carbon is the limiting factor for bacteria. The thesis is that with more carbon available the bacteria will out compete the algae, thereby repressing the algae grow.

I see this all the time that adding more Phosphate I get more algae. I don’t see that as mythological at all. Of course I am not adding any co2 or any excel. Recently I have been increasing the K and not dosing any P and I seem to be getting rid of more algae.
IF plants get the base nutrients they need, they will require more co2/carbon to grow properly.... this will cause algae.
your looking at it backwads. it takes a long time to get past that

i my tank stays at around 5 ppm phosphates and i grow very little algae. i have some in my overflow in areas i can't ever reach and get cleaned occaisionally. it never grows to anything significant.

i get a spot of diatoms here and there in darker places of my tank. or a tuft of black algae on a piece of wood occaisionally. my co2 tank was out for two weeks and i got some black algae then but with the re introduction of co2, some good maintenance i got it under control and is now all gone...
 

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I’ve been reading about how carbon is the limiting factor for bacteria. The thesis is that with more carbon available the bacteria will out compete the algae, thereby repressing the algae grow.

I see this all the time that adding more Phosphate I get more algae. I don’t see that as mythological at all. Of course I am not adding any co2 or any excel. Recently I have been increasing the K and not dosing any P and I seem to be getting rid of more algae.
Reduced carbon, eg, carbohydrates(think like us) are required for bacteria, but there's a ton of that in ANY planted tank, the plants leach ample amounts to supply bacteria, same deal in marine refugiums, this is why having a macro algae refugium is beneficial.

Adding PO4 to my non CO2 or Excel dosed aquariums does not induce algae.
Nor does it in my CO2 Excel enriched tanks.

Diana Walstad also has made the same observations within her own non CO2 enriched aquaria.

Correlation does not imply cause.
Adding PO4 likely just shifts the limiting nutrient from P to CO2.
It does not imply that PO4 is causing algae, if that were the case, then we'd expect to see it for all cases, we do not, so this hypothesis must be rejected as a potential cause. Note, this does not say why you have algae, only what the algae cannot be caused by independent of other factors.
 
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