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· Registered
72 Posts
Discussion Starter · #1 ·
Hi, i have 3 bags of ferts but i'm not sure how to use them
i've tried reading around to see how to does what, i've downloaded chuck's calculator but it doesnt seem to have one of my bags.

i have: Mono Potassium Phosphate, Potassium Nitrate and Plantex CSM+B (all from

Please help me out with a mixture that i can use to dose my 30 gallon.
i am using pressurized co2 system.

Sorry for the bother...

· Registered
72 Posts
Discussion Starter · #3 ·
Thanks for your reply.
I've went to the fert calculator and i'm not sure if i'm doign it right..

here are my results.

30 US Gallons, Nitrate in Potassium Nitrate.
112 grams added.
Volume of final solution - 591 ml
Desired ppm 5
Ml of stock solution to add 4.89 <--- is this how much i add per dosage?

· Premium Member
2,036 Posts

it's good to have 30 gallon tank because all the chemical concentration calculations are mostly done per 100 liters. The 30 gallon is 120 liters net, but with sand, decoration and so on, we can say 100 liters.

You have KNO3, KH2PO4 and TE (Trace Elements). We are missing MgSO4 and K2SO4 to make it a complete set. If your tap water has less then 2 dGH then you also need CaCl2.

KNO3 20 gram in 500 ml
4 ml / 100 l => 1.0 ppm NO3

KH2PO4 6 gram in 500 ml
1.2 ml / 100 l => 0.1 ppm PO4

MgSO4 17 gram in 500 ml
3 ml / 100 l => 0.1 ppm Mg

TE 24 gram im 500 ml
3 ml / 100 l => 0.1 ppm (Fe)

I would recommend this dosing for the first 3 weeks:
Water change 50 %, 2x a week. After water change dose 20 ml of KNO3 solution, 6 ml of KH2PO4 solution and 15 ml of MgSO4 solution.

This will make 10.0:1.0:6.7:0.0:1.0 / NO3:pO4:K:Ca:Mg .

Do not dose TE unless you see pale new growth. If you see it then start dosing 1 drop a day or more until the pale colour disappears.

Please do not forget to keep your CO2 at 30 ppm. What kind of light do you have?

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