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How much, im lost:(

1K views 7 replies 5 participants last post by  Sotty 
#1 ·
I have 300 gallons of water with heavily planted new plants.
I'm getting frustrated trying to figure how much to dose with the EI method.
I'd like to do 30% water changes. I just cant seem to grasp How much to start dosing with (ball park) so i can test and go from there. I checked the calculator thing out and i am now even more lost. I realize its dosing more nutrients than needed and WC resets it, i just cant seem to figure out what general amount to dose with. I asked my 5 year old to figure it out for me, she went to go get some crayons:/
 
#4 ·
EI dosing from sticky

40~60gal
50% H20 change-weekly
1/2 Tsp-KN03 3x a week
1/8 Tsp-KH2P04 3x a week
10ml or 1/8Tsp-Trace 3x a week
Optional
2-4ml-Fe/Iron 3x a week

This is the ball park to start in for a 40 - 60 gallon tank. Multiply by 5ish and go from there.

2.5 tsp kno3 3x week
5/8 tsp kh2po4 3x week
5/8 tsp CSM+B 3x week

That's what I would try, and sound right to me as its about twice as much as I used to dose in my 150 gallon.
 
#5 ·
^+1

Just do it!

I got instant results from dosing nitrate. The tank was under a massive green water siege and a daily 1/2 teaspoon of potassium nitrate stump killer cleared the 150 gallon tank in 4 days. Each day I could see further into the tank. I was sold on using NPK+micros after that!
 
#6 ·
Here are the concentrations you are aiming to add with every dose, roughly:

NO3: 7.5ppm
PO4: 1.3ppm
Traces: .5ppm Fe (assuming CSM+B as being used)

So, using your given 300g of water, and referencing the dosing calculator, we can calculate this schedule:

KNO3: 3x per week, 2.5 tsp + 1/8 tsp resulting in 7.37 ppm, close enough. Or, in grams, weigh out 13.9g.
KH2PO4: 3x per week, 1/4 + 1/8 tsp resulting in 1.29 ppm. Or, again, in grams weigh out 2.1g.
Traces: 3x per week, 2 tsp resulting in 0.49ppm. In grams, 8.7g

With any dosing scheme, watch for deficiencies to crop up, and keep excellent circulation in the tank.
 
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