All in one EI dosing AM or PM? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-25-2013, 06:57 AM Thread Starter
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All in one EI dosing AM or PM?

I'm dosing an all in one EI solution. The chelated iron does not react with the phosphate due to the ascorbic acid I add according to the recipe I follow. The pH of the solution ends being less than 6 because of the acid and I also use distilled water. I dose at night just before going to sleep because I usually forget to do it in the morning. My tank's pH is around 7.3 without the CO2 at night.

If I dose at midnight would the plants use any of the iron before it reacts with the phosphate? How long does it take for the iron to bind with the phosphate normally? Thanks.

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post #2 of 5 (permalink) Old 10-25-2013, 07:02 AM
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What's your recipe?
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post #3 of 5 (permalink) Old 10-25-2013, 07:06 AM Thread Starter
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50g potassium nitrate
11.5 potassium phosphate
20g potassium sulphate
40g epsom salt
2.5g ascorbic acid
1g potassium sorbate
30g CSM+B

1000mL distilled water
60ml dose on MWF, each 60mL is about 10ppm nitrate.
25% water change on Sunday.

By the way, my plants are growing well. I was just wondering if they would grow better if I dose in the morning instead.

Last edited by Jalopy; 10-25-2013 at 07:07 AM. Reason: plants are fine
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post #4 of 5 (permalink) Old 10-25-2013, 06:57 PM
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Dosing in the morning versus the evening should not make a difference, as following EI means you have an excess of nutrients in the water column anyway.

However, looking at your recipe, there may be the possibility that the iron in CSM+B will react with the potassium phosphate (causing insoluble ferric phosphate to precipitate).


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post #5 of 5 (permalink) Old 10-25-2013, 07:48 PM Thread Starter
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The ascorbic acid is supposed to drop the pH so that the chelated iron does not react with the phosphate. I'm basically wondering if plants will absorb nutrients at night or only when the lights are on?

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