Autodosing + E.I. - The Planted Tank Forum
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post #1 of 3 (permalink) Old 12-02-2006, 06:04 PM Thread Starter
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Autodosing + E.I.

I finally got a autodoser (DIY using air pump) setup for my 38 gallon tank. I will be dosing just NPK for now with it until I get another one setup for CSM+B. Anyways, things got a little confusing trying to figure out the detail of how much to add of the different ferts. Here's whats happening:

I have a reservoir (Gatorade Bottle) that holds 4000 ML of water. Approximately 280 mL of water will be pumped into the tank every day (for 1 minute, but that doesn't matter for this). One bottle of solution will last for 14 days. I tried to figure out what to add per day to fit with E.I., but I really don't know if I did it right. The reservoir bottle will contain a mix of the following:

1 3/4 tsp of KNO3
7/16 tsp of KH2PO4
1 3/4 tsp of K2SO4
About 4000 mL of water

According to my calculations (with the help of the Fertilator for some of them) I will have the following concentrations added every day:

N ~ 2.77 ppm
P ~ 0.85 ppm
K ~ 4.59 ppm

Can someone tell me if this seems about right? I have just been loosely following the dosing regime stick in this forum in the past and I am not sure what the ppm should be per day. This is a med/high light tank (96 watt CF over 38 gallons) with CO2 and I will be dosing CSM+B separately. It is heavily planted.
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post #2 of 3 (permalink) Old 12-04-2006, 02:53 AM
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I'd not worry so much about it this way.

4000 mls
280mls per day right?
Last 14 days right?

EI for a 38 gal for this would be
2 teaspoon KNO3
1/3 teaspoon KH2PO4

In another bottle, add traces, say for the same size:
TMG/Flourish etc: add 60 mls to the same size container.

Tom Barr

Tom Barr
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post #3 of 3 (permalink) Old 12-04-2006, 10:16 PM Thread Starter
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Thanks for the input. Somehow I managed to over-complicate my calculations when I first did them (they weren't incorrect, I just took 60 minutes to do what I could have done in 3 minutes). Anyways, I was thinking about getting another air pump and Gatorade bottle so I could make a micros bottle. I have 3/4 of a pound of Plantex CSM+B left, so I'm going to use that.

In a separate, but equal sized bottle (same conditions as the first) I will add:
1 1/8 teaspoon Plantex CSM+B which will give me the exact same amount of iron as 60 milliliters of Flourish (1.33 PPM of Fe).

My only other question is, should I add MgSO4 (7H2O) to the micros mix as well, if so, how much of that should I add?
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