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Nutrient Dosing Calculator

LondonDragon

Administrator
UKAPS Team
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21 Feb 2008
Messages
11,828
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London
Nutrient Dosing Calculator is now builtin to UKAPS:

Use the Calculators menu or using these links:

Nutrient Dosing Calculator
Nutrient Dosing Calculator

Nutrient Accumulation Calculator
Nutrient Accumulation Calculator

There is also the great IFC Aquarium Fert Calculator by @Zeus. and @Hanuman :


Any questions ask below

Cheers
Paulo
 
Last edited:

BanditCoaxx

Seedling
Joined
19 Oct 2020
Messages
23
Location
England
This looks like it's gonna be majorly handy, should've joined this forum sooner. One question though what percentage of my tank needs to be planted for this calculator to be accurate? I say accurate but I'm sure you know what I mean

Sent from my SM-J600FN using Tapatalk
 

dw1305

Expert
UKAPS Team
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7 Apr 2008
Messages
13,670
Location
nr Bath
Hi all,
One question though what percentage of my tank needs to be planted for this calculator to be accurate? I say accurate but I'm sure you know what I mean.
The easiest way to tailor the dosing to your particular situation is to use a <"conductivity meter"> (TDS meter) to monitor whether your conductivity (ions in solution) is rising. If conductivity is continually rising nutrients are accumulating and you need to change a bit more water, or add less in the way of fertiliser.

<"Estimative Index (EI)"> uses a 50% weekly water change to re-set your tank, and is used if you want optimal plant growth, add CO2 etc.

An alternative approach (the <"Duckweed Index">) uses the health and leaf colour of a floating plant (so not CO2 limited) as an indication of when to add nutrients. It is mainly (exclusively?) used by low tech aquarium keepers.

cheers Darrel
 

Raws69

Member
Joined
5 Oct 2020
Messages
173
Location
Essex
Hi

new to hobby, so couple of questions.

I have an ea 900, believe nett litres at 260.the tank has been set up for 2 weeks so still early, I’m using tic complete, am I right that I want to be aiming at ei daily, in which case this is telling me to add 31ml? This seems really high.

also do you dose to the nett value of the tank, or calculate size after hardscape is added?

cheers
 

Zeus.

Fertz Calc Meister
Joined
1 Oct 2016
Messages
4,574
Location
Yorkshire,UK
Hi

new to hobby, so couple of questions.

I have an ea 900, believe nett litres at 260.the tank has been set up for 2 weeks so still early, I’m using tic complete, am I right that I want to be aiming at ei daily, in which case this is telling me to add 31ml? This seems really high.

also do you dose to the nett value of the tank, or calculate size after hardscape is added?

cheers
Which is about right if you are after dosing TNC complete at EI levels. Thing with commercial ferts is they are basically expensive water. With a 260L tank DIY ferts are the way to go.

1604311625327.png

Cost of using TNC complete at the double-triple dose which is regarded as whats need to dose TNC complete to reach EI levels. It soon gets expensive when dosing commercial ferts at EI levels. APFUK do a starter kit which should get you going easy. Any questions about DIY ferts just do a new thread post in this 'fert dosing' section
 

Sammy Islam

Member
Joined
12 Mar 2019
Messages
692
Location
Hertfordshire
Hi

new to hobby, so couple of questions.

I have an ea 900, believe nett litres at 260.the tank has been set up for 2 weeks so still early, I’m using tic complete, am I right that I want to be aiming at ei daily, in which case this is telling me to add 31ml? This seems really high.

also do you dose to the nett value of the tank, or calculate size after hardscape is added?

cheers
Aquascaper 900? I think it's like 186L
 

Raws69

Member
Joined
5 Oct 2020
Messages
173
Location
Essex
Which is about right if you are after dosing TNC complete at EI levels. Thing with commercial ferts is they are basically expensive water. With a 260L tank DIY ferts are the way to go.

View attachment 155945
Cost of using TNC complete at the double-triple dose which is regarded as whats need to dose TNC complete to reach EI levels. It soon gets expensive when dosing commercial ferts at EI levels. APFUK do a starter kit which should get you going easy. Any questions about DIY ferts just do a new thread post in this 'fert dosing' section
Hi just to confirm is this 31ml over the course of the week, ie roughly 4.5ml daily? And yes I will change this to the correct volume
 

Zeus.

Fertz Calc Meister
Joined
1 Oct 2016
Messages
4,574
Location
Yorkshire,UK
Hi just to confirm is this 31ml over the course of the week, ie roughly 4.5ml daily? And yes I will change this to the correct volume
No, you worked out the amount needed to be dosing TNC at an EI level of ferts with 'EI daily' so the amount you put in a day is 31 ml, hence going down the DIY fert route will save you over £100 per year with your tank
 

Oetloet

Member
Joined
24 Nov 2020
Messages
25
Location
Netherlands
Hi Guys,

I am having some trouble with the calculator, i want to dose Tropica specialised in my 60L working with the EI. If i dose 28ml per week ( 2 pumps per day = 4ml per day) The charts give me this result:
Is this enough to cover everything for working with EI? The charts only tell me FE (iron?)

I hope you understand me, my english is not the best :)

Thanks in advance for helping me out.

1606220279926.png
 

Wookii

Member
Joined
13 Nov 2019
Messages
3,006
Location
Nottingham
Hi Guys,

I am having some trouble with the calculator, i want to dose Tropica specialised in my 60L working with the EI. If i dose 28ml per week ( 2 pumps per day = 4ml per day) The charts give me this result:
Is this enough to cover everything for working with EI? The charts only tell me FE (iron?)

I hope you understand me, my english is not the best :)

Thanks in advance for helping me out.

View attachment 156889

I think it highlights just how dilute the Tropica ferts are. To get close to EI levels on the macros, I think you need to increase that dose by around 4-5 times that, around 140ml a week (so 10 pumps a day) - though at that level you are overdosing the micros - hence the warning on the calculator (presumably due to the copper).

1606224127900.png


You can of course to less that those levels, but at your 28ml per week, I would say that is too low for EI and is a pretty lean dose.
 

Oetloet

Member
Joined
24 Nov 2020
Messages
25
Location
Netherlands
I think it highlights just how dilute the Tropica ferts are. To get close to EI levels on the macros, I think you need to increase that dose by around 4-5 times that, around 140ml a week (so 10 pumps a day) - though at that level you are overdosing the micros - hence the warning on the calculator (presumably due to the copper).

View attachment 156891

You can of course to less that those levels, but at your 28ml per week, I would say that is too low for EI and is a pretty lean dose.

Oh boy i thought 28ml per week was a lot already.. 140ML per week is also extremely costly.... You really think 140ml is correct?? Im still schocked o_O
There must be other people using Specialized @ 60L setup for EI. i searched the forums but i could not find anyone yet.

Maybe anyone in this topic can give me some help or advice?

Im still new in the hobby so excuse me if i am missing out on information you need.
 

Wookii

Member
Joined
13 Nov 2019
Messages
3,006
Location
Nottingham
Oh boy i thought 28ml per week was a lot already.. 140ML per week is also extremely costly.... You really think 140ml is correct?? Im still schocked o_O
There must be other people using Specialized @ 60L setup for EI. i searched the forums but i could not find anyone yet.

Maybe anyone in this topic can give me some help or advice?

Im still new in the hobby so excuse me if i am missing out on information you need.

Well standard EI targets are (weekly dose):

30ppm Nitrate (N)
3ppm Phosphate (P)
30ppm Potassium (K)
10ppm Magnesium (Mg)
0.5ppm iron (Fe)

So assuming I've entered it into the calculator correctly, then the 140ml per week doses fairly close to this for the NPK, but as I say, is three times the required dose for Fe (and possibly the other micros).

It is expensive, which is why a lot of folks switch to dry salts which are a lot cheaper, and give a lot more dosing flexibility.

EDIT: You can buy the salts in a kit from APFUK, here: https://www.aquariumplantfood.co.uk/fertilisers/dry-chemicals/starter-kits/ei-starter-kit.html

If they don't ship to the Netherlands, perhaps @zozo can point you in the direction of local suppliers.
 

Oetloet

Member
Joined
24 Nov 2020
Messages
25
Location
Netherlands
Well standard EI targets are (weekly dose):

30ppm Nitrate (N)
3ppm Phosphate (P)
30ppm Potassium (K)
10ppm Magnesium (Mg)
0.5ppm iron (Fe)

So assuming I've entered it into the calculator correctly, then the 140ml per week doses fairly close to this for the NPK, but as I say, is three times the required dose for Fe (and possibly the other micros).

It is expensive, which is why a lot of folks switch to dry salts which are a lot cheaper, and give a lot more dosing flexibility.

EDIT: You can buy the salts in a kit from APFUK, here: https://www.aquariumplantfood.co.uk/fertilisers/dry-chemicals/starter-kits/ei-starter-kit.html

If they don't ship to the Netherlands, perhaps @zozo can point you in the direction of local suppliers.
If you see it that way then it should be correct 🤣 I already have a backup plan wich i will going to try.. in the Netherlands we can get All in one from planted box this is a lot cheaper then Tropica.
I see a lot of people getting good results and im curious if it will work for me. Might switch over to dry salts later in the future.

I dont want to make things to complicated because im fairly new to the hobby, thats why going for the EI (or close to) seems the most simple way for me.

Thanks for your help 😀
 

Zeus.

Fertz Calc Meister
Joined
1 Oct 2016
Messages
4,574
Location
Yorkshire,UK
1606229710102.png


1606229787018.png

Is correct and if you dose 2-4 times a week you be in the Full EI range for most nutrients, except K, TSN is ammonium/urea based fert - as the only way to clone it and get similar targets for N, P, and K as tropica get is to use ammonium/urea salts, so I would add a caution if using TSN at Full EI dose esp if you have sensitive livestock. DIY ferts would be better or another commercial fert like TNC complete which uses KNO3
1606230482424.png

Remember the [N] x4 equals approximately [NO3] so 4ppm N is approx 12ppm NO3

I think when Rotala targets the EI dose it focuses on the [Fe] only @fablau may be able to confirm this.

We are hoping to have a new fert calculator out for Xmas, which should make DIY fert much easier, but with a 60L tank is it worth the effort? all depends if you wish to dose at FULL EI levels or at TSN levels - If going for full EI levels- Yes, if TSN levels then no IMO
 

Oetloet

Member
Joined
24 Nov 2020
Messages
25
Location
Netherlands
View attachment 156892

View attachment 156893
Is correct and if you dose 2-4 times a week you be in the Full EI range for most nutrients, except K, TSN is ammonium/urea based fert - as the only way to clone it and get similar targets for N, P, and K as tropica get is to use ammonium/urea salts, so I would add a caution if using TSN at Full EI dose esp if you have sensitive livestock. DIY ferts would be better or another commercial fert like TNC complete which uses KNO3
View attachment 156894
Remember the [N] x4 equals approximately [NO3] so 4ppm N is approx 12ppm NO3

I think when Rotala targets the EI dose it focuses on the [Fe] only @fablau may be able to confirm this.

We are hoping to have a new fert calculator out for Xmas, which should make DIY fert much easier, but with a 60L tank is it worth the effort? all depends if you wish to dose at FULL EI levels or at TSN levels - If going for full EI levels- Yes, if TSN levels then no IMO

Thanks for the feedback Zeus, sounds very complex to me but i think i am step closer to optimizing my fert-game :)
I will try to keep you guys posted about my new scape, openend a topic in the welcome forum with a picture of my hardscape so far.
 

Zeus.

Fertz Calc Meister
Joined
1 Oct 2016
Messages
4,574
Location
Yorkshire,UK
sounds very complex to me but i think i am step closer to optimizing my fert-game :)

Just a lot to take in all at once, I'm sure @zozo knows the best places to get salts from in your neck off the woods
 

zozo

Member
Joined
16 Apr 2015
Messages
8,287
Location
Netherlands
Actually only one - below... :) Or the Farmers union (Boerenbond) if you want to go realy BIG... :)

https://www.aquariumbemesting.nl/nl/home
💪

Then there are several online pharmacies to order Epsom salt by the Kilo... That can be ordered with some other household needs we use any way to reduce the shipping costs.
 
Last edited:

zozo

Member
Joined
16 Apr 2015
Messages
8,287
Location
Netherlands
Great Zozo, thanks for the information!

And it actually ain't all that complex... :) What we need is a decent amount of NPK and trace elements. Simply add enough on a weekly basis of all and redo the whole after a weekly water change. Then you always have enough that's in simple words EI is all about.

Me personally I use this calculator ( You need to have Flash player installed).
http://theaquatools.com/fertilization-calculator/

It is really simple as shown in the picture, specify aqaurium volume, amount of grams added and review the ideal PPM result automaticaly calculated.
Knipsel.JPG


You can add the dry salts (from the above webshop) in grams into a 1-litre jar with water stir it and add it after a water change directly to the tank.

24 hours later add the correct amount of trace elements you made in solution with the advised amounts.

Can't be more simple, no need to bust your brain over it... :)
 
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