Adapting IFC stock solutions?

[Hufsa]

Ive been struggling with this for hours now and I just cant wrap my head around what I need to do 😵
I have stock solutions for traces that were made using the IFC calculator.
These solutions last a while, so I have previously made adjustments to the amount of stock solution used, based on how many ppm I want to add in a particular batch.
(I just multiply or divide both by the same number, thus making sure the gram amount doesnt change in the IFC)
Until now I have only done this for the main tank, so the ppm per dose, dose size, total volume of fert and tank volume have all been the same from batch to batch.

But now I want to use these stock solutions for a much smaller aquarium. There is a change to ppm, dose size, total volume of fert and tank volume 😵
And I just cant work out how to adapt the numbers so I can use the same stock solutions

I think I might need to just forget about the main tank, and pretend I made these stock solutions for the small tank.
But im terrible with percentages, could a kind someone hold my hand through working out how much to add?
If I get the formula for just one of them I should be able to do the rest myself (I think).

Stock solution 1:
Zn 14% EDTA, 8.5 gram in 500 ml
Stock solution 2:
H3BO3 (Boric Acid), 6.81 gram in 500 ml
Stock solution 3:
Cu 14% EDTA, 3.401 gram in 200 ml
Stock solution 4:
(NH4)6Mo7O24 · 4H2O, 0.876 gram in 200 ml
Stock solution 5:
NiSO4 · 6H2O, 0.5331 gram in 500 ml

The small tank details:
Tank volume 40 liter
Dose size 5 ml daily (a weekly dose would be 35 ml, if that makes it easier to work out)
Fert volume 300 ml
Wanting a weekly amount of (or in other words, 35 ml should add;
0,014 ppm Zn
0,014 ppm B
0,00425 ppm Cu
0,00425 ppm Mo
0,00005 ppm Ni


Hope someone can help this poor feeble-minded moomin 🤕🙏

 

[dw1305]

Hi all,

But now I want to use these stock solutions for a much smaller aquarium.

The easiest way is to reduce the amount dosed by the difference in volume. Tank is half as big? dose half the volume.

As an example, if you dose 10mL in a 100 litre tank, you would dose 5 mL in a 50 litre and 1 mL in a 10 litre and they would all give you the same ppm (mg / L).

cheers Darrel

 

[Miniandy]

Divide the Dosage (in ml) for the big tank by the big tank volume in litres. This will give you a dose per litre. Whatever that number is can now be multiplied by the new tank volume in lites. The result is the equivalent dosage in ml for the new tank.

 

[Hufsa]

Thank you so much for the answers! 😊 I will try it as soon as my brain has booted up for the day 😅

 

[_Maq_]

35 ml should add 0.014 mg/L Zn to 40 liter tank.
That means that 35 ml should contain 0.014 * 40 = 0.56 mg Zn.
Total volume of stock solution should be 300 ml ...
... therefore you need 300/35 * 0.56 = 4.80 mg Zn.

Your current stock solution contains 8500 mg 14 % Zn in 500 ml solution...
... so it's 8500 * 0.14 = 1190 mg Zn.

You need 4.80 mg Zn from 1190 mg Zn ...
... 4.8 / 1190 = 0.004033613
Those 1190 mg Zn are diluted in 500 ml water ...
... so you need 0.004033613 * 500 = 2.016806723 ml of your "BIG" stock solution to get 4.8 mg Zn. Then you add water up to 300 ml and your "SMALL" solution is ready.

 

[KirstyF]

Smart people feel free to check my math but shouldn’t a simple division (or two) work for stock solutions if you have a base to work from (IFC)

Eg: let’s say 5ml of stock solution put into your dosing solution gave you 0.15ppm across 60 doses (300ml dosing solution) in a 180ltr tank and you now want 0.1ppm in a 40ltr tank.

1 - First adjust for the volume
5ml /60 doses = 0.0833ml per dose
0.833 /180(ltrs) = 0.00046278 per litre
0.00046278 * 40 = 0.0185
0.0185 x 60 doses = 1.11ml
So to get the same ppm you would need to put 1.11ml of stock solution into your dosing solution.

(Alternatively 40ltrs /180ltrs = 22.22% and 22.22% of 5ml is 1.11ml 😊)

But let’s say you want to adjust ppm as well.

Your 5ml dose used to give you 0.15ppm and now you only want 0.1ppm

(0.1 / 0.15) x 100) = 66.66%

So take your new dose and divide by 66.66%
(1.11ml /100) x 66.66) = 0.74ml

So you would need to put 0.74ml into your dosing solution.

Or

Adjust for ppm
5ml gave 0.15ppm
(0.1ppm / 0.15ppm ) x100) = 66.66%
(5ml /100) x 66.66) = 3.33ml

Then adjust for volume
3.33ml / 180ltrs = 0.0185per litre
0.0185 x 40litres = 0.74ml

However much of your stock solution you used to add to your dosing solution, the same calculation should work….I think!

 

[hypnogogia]

Why is everybody over complicating this. Simplest answer is post #3 by @Miniandy?

 

[KirstyF]

Why is everybody over complicating this. Simplest answer is post #3 by @Miniandy?

I think because @Hufsa is talking about stock solutions not just dosing solution. What @Miniandy has suggested would work perfectly to simply adjust the dosing solution and keep the same ppm’s as the large tank, but to maintain the ability to adjust the ppm of each individual fert, via the volume of stock solution added, and also keep the same volume of dosing solution (via an auto-doser I believe) needs just a wee bit more tinkering! 😊

 

[Hanuman]

Although not the answer you are looking for, here is a simple solution for you that does not involves headaches.
Redo stock solutions for the 40L tank. Done. You shouldn't need more than 100ml of these stock solutions unless you have hundreds of tanks.