Is this correct? EI dosing via Seachem! - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 09-09-2014, 01:14 PM Thread Starter
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Is this correct? EI dosing via Seachem!

Hi Guys and Gals

I know many of you know much more than me so i wanted to sense check.
It appears that I have massively been underdosing my tank.

Tonight, I used the Seachem Plant Dose Calculator v1.0 which allows you to enter a product (seachem obviously), a tank volume (in my case 43G) and a desired ppm of each.

My understanding is that I want to aim, over a week of dosing for a total of:

Nitrate: 30 ppm
Phosphorous: 20 ppm
Iron: 0.83 ppm
Potassium: 20 ppm
Comprehensive: 0.5 ppm

I was then going to add a cap of trace 3 times a week and a cap of excel once a day except on the first day where ill add 5 caps (25ml).

I am adding DIY CO2 which has a healthy pressure and a calculated ppm (using KH and pH method) of around 36 ppm using Mr Barr's table here http://www.barrreport.com/showthread...O2-pH-KH-table (FYI pH is ~6.7 during photo period and KH is around 6 degrees - if it matters GH is around 9 degrees). I have very high light (see sig) which runs about 9 - 10 hrs per day in two intervals.

SO! Summing up the above, to reach the target ppm over a week, the Seachem calculator tells me to add a total of:

Number of Caps =
Nitrogen 65
Phosphorus 15
Iron 3
Potassium 15
Comprehensive 9
Trace 3

So is the following correct or not?



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post #2 of 8 (permalink) Old 09-09-2014, 02:17 PM
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First, if you have fish in there you may wish to compensate for the nitrates they will provide via the bio-filter. I might for example set the calculator at 20 PPM for that
but check it at the 6th day to see how much it ended up with after the fish waste factor was added in.
Second is that I wonder if this is not high in cost when compared to dry ferts...
I have on a couple of occasions used up to 4 x the recommended dose of Excel when using a syringe to spot dose it on algae.
I added more than the recommended amount on the first use of it but never since then(actually I use double doses).
I feel that the remaining water contains some of it when I do a water change so I don't feel any need to increase the regular amount that I use just after the water change.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #3 of 8 (permalink) Old 09-09-2014, 04:05 PM
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Get dry ferts. Seachem is basically just buying heavily diluted dry ferts in a bottle of water.

With a 43G tank you will need to buy all new bottles in like a month.

Also Raymond is right in starting slow with respect to nitrates. Fish provide quite a bit.


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post #4 of 8 (permalink) Old 09-09-2014, 07:01 PM
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i may be wrong but the Dose app gives results in nitrogen form. if you want to have a nitrate level of 30 ppm, you should do your own calculation and replace 0.25 with 0.05 in the formula.
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post #5 of 8 (permalink) Old 09-09-2014, 08:14 PM Thread Starter
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Thanks guys.

Firstly I already have bulk Seachem stuff ATM as I need something basic that my girl can manage while I'm away, and really money isn't an issue. I'll probably go down the dry ferts route when I get time to obtain and mix etc..

In regards to nitrate vs nitrogen, shouldn't the seachem calc 'know' that I'm selecting a desired ppm based on their product? Can someone confirm this please?

Finally, nitrate is virtually zero in the tank at the end of most days based on API drop tests...

Can someone verify the addition of the number of caps for the EI method based on my tank size and desired ppm? Thanks heaps guys!


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post #6 of 8 (permalink) Old 09-09-2014, 09:19 PM
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i just opened now the dose app, and it says there at the bottom screen that if you want to get the nitrate equivalent, divide the results by 5.
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post #7 of 8 (permalink) Old 09-09-2014, 10:03 PM
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I would use this calculator instead. Select premixed and you'll see the Seachem products listed. No need to do any math this way. The amounts below are what it reports for 43 gallons.

Nitrogen = 18ml (~3 1/2 caps)
Phosphorus = 52ml (~10 caps)
Potassium = 25ml (5 caps)
Comprehensive = 25ml (5 caps)
Iron = 8ml (~1 1/2 caps)
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post #8 of 8 (permalink) Old 09-09-2014, 10:35 PM Thread Starter
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Thanks guys. I appreciate the help. Just getting wildly different answers. Always concerned when I'm getting orders of magnitude difference...


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