#### gabriel.basso

##### Member

Hey guys, how are you?

I'm starting to dose EI on my tank and got a little confused using Rotala Butterfly calculator.

My tank has 180 liters (49 gallons), but I considered only 126 liters (70%), since it has a very high slope, a lot of substrate, woods and stones.

To get the results I considered then 126 liters, a solution of 800ml, and 40ml per dose.

I made a spreadsheet compiling the results:

The calculator shows me the results based on these targets:

- NO3: 7.5ppm per dose / 22.5ppm 3x per week

- PO4: 1.3ppm per dose / 3.9ppm 3x per week

- K: 7.5ppm per dose / 22.5ppm 3x per week

- Mg: 5ppm per dose / 15ppm 3x per week

At this point I already noticed a slight difference between these targets and what I found here in UKAPs posts as a weekly ppm reference:

- NO3: 20ppm

- PO4: 3ppm

- K: 30ppm

- Mg: 10ppm

Initially for the macro solution I was thinking of dosing only KNO3, KH2SO4 and MgSO4, but in the end I would have a lack of K, only 15ppm per week when the target is 30ppm. So I added K2SO4 to the list to reach the target.

Therefore I have some questions:

- Are those Rotala calc results correct?

- The amount of Mg to be added into a 800ml solution for a 126 liters tank is really 575mg (0,57kg)?!!!

- Am I correct adding K2SO4 to the solution to reach K target?

Sorry for my english... its not my native language but I hope you will understand.

Thanks!

I'm starting to dose EI on my tank and got a little confused using Rotala Butterfly calculator.

My tank has 180 liters (49 gallons), but I considered only 126 liters (70%), since it has a very high slope, a lot of substrate, woods and stones.

To get the results I considered then 126 liters, a solution of 800ml, and 40ml per dose.

I made a spreadsheet compiling the results:

The calculator shows me the results based on these targets:

- NO3: 7.5ppm per dose / 22.5ppm 3x per week

- PO4: 1.3ppm per dose / 3.9ppm 3x per week

- K: 7.5ppm per dose / 22.5ppm 3x per week

- Mg: 5ppm per dose / 15ppm 3x per week

At this point I already noticed a slight difference between these targets and what I found here in UKAPs posts as a weekly ppm reference:

- NO3: 20ppm

- PO4: 3ppm

- K: 30ppm

- Mg: 10ppm

Initially for the macro solution I was thinking of dosing only KNO3, KH2SO4 and MgSO4, but in the end I would have a lack of K, only 15ppm per week when the target is 30ppm. So I added K2SO4 to the list to reach the target.

Therefore I have some questions:

- Are those Rotala calc results correct?

- The amount of Mg to be added into a 800ml solution for a 126 liters tank is really 575mg (0,57kg)?!!!

- Am I correct adding K2SO4 to the solution to reach K target?

Sorry for my english... its not my native language but I hope you will understand.

Thanks!

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