EI Dosing Regime


Junior Poster
Jan 24, 2005
Portland, OR
Hope this is the appropriate forum for this post.

Looking for some direction on getting off to a good start on a new 90g.

Tank is up and running, plant order due to arrive in time for weekend planting.

The tank will have a moderate to heavy fish load, eventually.

Here are some details:

Substrate: Flourite

Lighting: 5 x 54w T5HO w/ three ballasts: 2 x 54w, 2 x 54x, 1 x 54w. Can run from 54w to 270w.

CO2: 10lb tank w/ regulator, solenoid, dual Red Sea 500 Reactors, drop checker, 4 dKH reference solution.

Filtration: 2 x Rena Filstar XP2.

Ferts: I have Flourish, Flourish Iron, Excel, KNO3, KH2PO4, GH Booster, and also some Equilibrium on hand.

Water supply: Tap water -- Alkalinity: 1-2 dKH, General Hardness: 1-2 dKH, Nitrate & Phosphorous < 1 ppm, EXCEPT when the city switches to or blends in their alternative groundwater supply (2-3x/year when demand is high and/or excessive turbidity in surface water supply) in which case alkalinity ranges from 3-7 dKH, hardness 2-5 dKH, and nitrate/phosporous still < 1 ppm.

So, regarding the EI regimen, I will do a 50% water change on Saturday or Sunday. Can you:

1) Recommend dosing amounts and a schedule for macros & micros?

2) Offer suggestions for prepping water change water w/ GH Booster or Equilibrium?

3) Comment on any benefit in also dosing Excel?

Thanks so much.

Tom Barr

Staff member
Jan 23, 2005
For 90 gallon:

50-70% weekly water change

Add: 2x a week: 1 tsp pf GH booster
Add 3x a week:
3/4 teaspoon KNO3
1/8-1/4 teaspoon KH2PO4
Traces: 15-20mls 3x a week Flourish, 2x a week 5mls Flourish Fe
Maybe 30mls Excel after water change or 1-2 days prior to the water change.
This is optional though(Excel)

The rest is really all about the gas, CO2.
Plant very heavily from the first day on.

Tom Barr


Junior Poster
Jan 24, 2005
Portland, OR
Great. Thanks Tom.

Now, with regard to CO2, I have the two reactors and a solenoid with timer. I also have a pH controller but was not planning to use it to control CO2. Rather, I was planning to have the CO2 on basically when lights are on. I could, however, use the pH controller as a backstop, perhaps to override the timer should the pH drop too low. Not sure if that is overthinking things, though.

I also have an airpump and airstone I can run on another timer, perhaps at night.

Do you have suggestions for best practices regarding the management of CO2?

Thanks again.