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Discussion Starter · #1 ·
Hello,
I have a 200 gallon that I am currently dosing with the EI regimen. I am dosing the amount for a 150 gallon. I know that EI usually involves a 50% water change once a week. However, I have been doing water changes twice a week because my water seems to get a yellow/brownish tint by the middle of the week. I have a feeling its due to tannins released from my ohko stone (clay not completely removed at the start). Anyways, would this mean I would have to double or at least increase the amount of ferts I dose each day to make up for the amount lost from the second water change?

Thanks
 

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I think you would be fine just not dosing the day you do the WC, as EI dumps a lot of ferts into the water. You may want to try seachem purigen, it works wonders for tannins.
 

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Why not test the NO3 as proxy for all the ferts? If the NO3 is staying in the good range then assume everything else is, too, unless you see a deficiency or toxicity.
If you have other tests, use them, too.
 

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Discussion Starter · #5 ·
I think you would be fine just not dosing the day you do the WC, as EI dumps a lot of ferts into the water. You may want to try seachem purigen, it works wonders for tannins.
Hmm. But that would mean not dosing for a total of two days? I just measured the nitrate levels after my second water change and it seems to be at 5-10 ppm. Seems a bit low? I actually have purigen in it already but the yellow tint keeps coming back. So Im wondering whether it might be something else. Any ideas?

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Why not test the NO3 as proxy for all the ferts? If the NO3 is staying in the good range then assume everything else is, too, unless you see a deficiency or toxicity.
If you have other tests, use them, too.
I guess i might have answered my own question in the previous reply. Maybe I will up the dosing since it seemed a bit low after the second water change?
 

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Hmm. But that would mean not dosing for a total of two days? I just measured the nitrate levels after my second water change and it seems to be at 5-10 ppm. Seems a bit low? I actually have purigen in it already but the yellow tint keeps coming back. So Im wondering whether it might be something else. Any ideas?
Maybe just fine particles in the water? Try some fine filter floss. Did you recharge the purigen? When it looks a dark brown color it needs to be recharged. I have heard that above 5 PPM nitrates is enough for plants. Try to do one WC on a micro day and the other on an NPK day. if you notice deficiencies then up the dosing on the other days.
 

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Discussion Starter · #7 ·
Maybe just fine particles in the water? Try some fine filter floss. Did you recharge the purigen? When it looks a dark brown color it needs to be recharged. I have heard that above 5 PPM nitrates is enough for plants. Try to do one WC on a micro day and the other on an NPK day. if you notice deficiencies then up the dosing on the other days.
Yea, fine particles is another thing. I have not recharged the purigen yet but will soon. I have been experiencing a lot of stem rot on my ludwigia arcuata and brevipes and not sure why. Other plants have been doing well. Is this indicative of a particular nutrient deficiency?
 
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