Estimative index fertilizing method


Estimative index (EI) method was found by Tom Barr. Basic idea of this method is to provide excess amount of nutrients within a week. Every week, you have to change 50% of water to set the proper amount of nutrients back. This will ensure, that there will be continuously enough nutrients in a water column and your plants will thrive.

There won’t be any deficiency symptoms on your plants and you can be absolutely sure, that problem is not in nutrients. That’s why is this method so fabulous. If there is some kind of plant growth problem, you can be sure, that nutrients are ok and you know that problem is in CO2 and bad circulation in your tank. So it is easy to fix it. Just add some more CO2 and improve your water flow inside a tank.

 

 

Dosing recommendations for high light planted tank:

10 – 20 Gallon tank

1/8 tsp KN03 3x a week
1/32 tsp KH2P04 3x a week
1/32 tsp Tenso cocktail or CSM+B 3x a week

1/2 tsp MgSO4x7H2O 3x a week
weekly 50% water change

20 – 40 Gallon tank

1/4 tsp KN03 3x a week
1/16 tsp KH2P04 3x a week
1/16 tsp Tenso cocktail or CSM+B 3x a week

2/3 tsp MgSO4x7H2O 3x a week
weekly 50% water change

40 – 60 Gallon tank

1/2 tsp KN03 3x a week
1/8 tsp KH2P04 3x a week
1/8 tsp Tenso cocktail or CSM+B 3x a week

1 tsp MgSO4x7H2O 3x a week
weekly 50% water change

60 – 80 Gallon tank

3/4 tsp KN03 3x a week
1/4 tsp KH2P04 3x a week
1/4 tsp Tenso cocktail or CSM+B 3x a week

1 and 1/2 tsp MgSO4x7H2O 3x a week
weekly 50% water change

100 – 125 Gallon tank

1 and 1/2 tsp KN03 3x a week
1/2 tsp KH2P04 3x a week
1/2 tsp Tenso cocktail or CSM+B 3x a week

2 and 1/4 tsp MgSO4x7H2O 3x a week
weekly 50% water change

1/8 tsp should fill a 1/4 tsp in 2 tries, 1/16 tsp in 4 tries, and a 1/32 tsp in 8 tries

You can lower these amounts if you have low light or low-tech aquarium. You can add some extra potassium (K) from Potassium Sulfate (K2SO4) but it’s not necessary.

These fertilizers will add:

Nitrate (NO3) 25 ppm per week
Potassium (K) 20 ppm per week
Phosphate (PO4) 3 ppm per week
Magnesium (Mg) 10 ppm per week
Iron (Fe) 0.5 ppm per week

 

 

Plants aren’t in a good shape and algae is present. Why is that?

You can be 100% sure that problem is not in nutrients now. So we can almost certainly say, that you have too low levels of CO2, weak water flow or you provide poor maintenance to your aquarium.

Just tweak a water circulation little bit and add some extra CO2 to achieve 25 – 30 ppm CO2 levels and you will be fine. You can also reduce light for a while. Algae will disappear.

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