# Why the big difference?

949 Views 9 Replies 4 Participants Last post by  buckwheet
Ok ,so I've been dosing according to the Yet Another Nutrient Calculator ,for a while now.- EI Low Light/Weekly method

I dose Flourish K and P.I just noticed that ,on the Flourish P bottle ,they recommend 2.5 ml for 80 liters ,once or twice a week.

When comparing to the calculator ,the YANC says I need to add 19 ml for an 80 liter tank ,to get to 1 ppm:
To reach your target of 1 ppm PO4 you will need to add 19 mL Flourish Phosphorus to your 80.0 L aquarium to yield the desired 1 ppm of P .WTF??

Element ppm/degree K 0.41 K2O 0.50 P 0.33 P2O5 0.75 PO4 1.00

Now let's take Flourish K.
The bottle says 5 ml for 125 liters ,repeated 2 or three times a week.
Be it 15 ml for 125 liters a week.
The YANC says
To reach your target of 10 ppm K you will need to add 26 mL Flourish Potassium to your 125.0 L aquarium to yield

Element ppm/degree K 10.00 K2O 12.08These dosages have been calculated with the Low Light / Weekly method.

There is a big difference still .....is there any catch to it ,something I'm missing?Does the low light weekly method assume the usage of Excel or something?Please help!
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Let me put it another way then....How do YOU dose Flourish P and Flourisk K in your tanks?I just want to make an idea...
Personally, I wouldn't care what Seachem said I should dose. I would just stick to whatever other guide you are using.
are you confusing one calculator for another?

seamchems calculator is setup for seachem product bottle concentration.
to dose according to any given volume of water

EI dosage calculators are set up for the given concentration
you'ed mix the dry ferts into a 500 ml bottle. and dose accordingly to any given volume of water.to achieve a given ppm.

I dose all seachem and use their recommendation chart.

another thing seachem assumes a 5% weekly water change.

EI dosing assumes a 50% weekly "reset" water change, and an over abundance of nutrients.

seachem may be set up to mimic a weekly macro & micro offset daily
dosing. but not the EI concentrations
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are you confusing one calculator for another?

seamchems calculator is setup for seachem product bottle concentration.
to dose according to any given volume of water

EI dosage calculators are set up for the given concentration
you'ed mix the dry ferts into a 500 ml bottle. and dose accordingly to any given volume of water.to achieve a given ppm.

I dose all seachem and use their recommendation chart.

another thing seachem assumes a 5% weekly water change.

EI dosing assumes a 50% weekly "reset" water change, and an over abundance of nutrients.

seachem may be set up to mimic a weekly macro & micro offset daily
dosing. but not the EI concentrations
I chose "premixed fertiliser" and then ,the Seachem P and K ,to calculate for the EI/low light weekly.Since we cannot measure the K in our tanks ,I tried to measure the PO4 ,right after dosing(1 ppm according to the calc) ,and then ,measure in the end of the week ,right before the water change.I know that tests aren't accurate ,I just wanted to make an idea about the uptake.
In the end of the week the tests still showed PO4 being present ,but the color was really light (0.2-0.4 ppm) - to say it in numbers.

Which means I can safely lower my dosing ,until the test shows almost no PO4 before the water change ,right?and ,of course ,keep an eye on the plants ,and read their signals - better than any test ,from what I hear ,and makes sense.
That way I will find that so called "critical point" that people talk about when using the low light/no Co2 method.From there ,I can safely begin to postpone WC ,until maybe ,once a month ,or once every 2 months.
I may be wrong about this ,that's why I need help ,to make sure what I intend to do is right.Feel free to chime in.
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If you have fish in your tank why would you want to get away from weekly water changes? They need it. Forget the plants.

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If you have fish in your tank why would you want to get away from weekly water changes? They need it. Forget the plants.

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They need it why. Plenty of folks here doing very few water changes.

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I can't speak for what others do, but I usually don't let that guide me in what I should do. Reading simple articles on the importance of water changes should be enough. Though arguably plants can ease the need slightly if you have ample plants and they are healthy, compared to the amount of stock you keep, but having plants does not negate the need of your fish. Remember your tank is a closed environment, not like in nature.

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Just as many articles say the opposite so I guess just do what makes you smile.

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well, I'm talking about the original question(s) "Why the big difference?"

maybe what I should have said is, are you confusing one method and/or product for another?

I've been dosing according to the Yet Another Nutrient Calculator ,for a while now.- EI Low Light/Weekly method
I dose Flourish K and P.I just noticed that ,on the Flourish P bottle ,they recommend 2.5 ml for 80 liters ,once or twice a week.

yup, that's what they recommend! for their product!
they are NOT trying to achieve a 1 ppm of PO4 "EI Low Light/Weekly method"
or any other EI method. you are!

To reach your target of 1 ppm PO4 you will need to add 19 mL Flourish Phosphorus to your 80.0 L aquarium to yield the desired 1 ppm of P .WTF??

right.........?
according to Wet's EI modeling calculator to achieve a 1 ppm of seachem PO4 for a "EI Low Light/Weekly method"

(seachems calculator comes out to 20g/ current 0ppm/ desired 1.00ppm/
required 3.3 caps or 16.6 ML) but I guess that would be splitting hairs!

to save yourself a bunch of confusion of mixing methods and or product. why don't you go ahead and get some dry KH2PO4. mix 11.463g into a 500ml container. Add 5.0 mL of that mix to your 80.0 L aquarium to get 1.00ppm of PO4.
do what ever water changes a "EI Low Light/Weekly method" recommends
stick to one method!
and one "product (dry/or seachem) just to keep it simple!

back to the original question, "Why the big difference?"
seachem does not mix 11.463g of KH2PO4 into their 500ml bottles!!!:icon_wink
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