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Discussion Starter · #1 ·
I have followed EI dose for couple months. The plant seems like it. However, I found some problems recently. There are some black on the leaves(BBA?). There is green algae on glass. Yesterday, I tested my NO3 and PO4. It is very high! NO3 about 60ppm and P about 10ppm. I am not sure if there is some problem of my test kit. But I used this test kit for a while. It never read N and P such high. I use Tek 4x55w on my 100 gal tank. pressurized CO2. heavily planted.
 

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If you follow the EI dosing amounts and do 50% water changes every week, you can't build up that much nitrate or phosphate. I'm assuming your tap water is not abnormally high in either one. So, either you are dosing more than EI recommendation or the test kits aren't accurate, which can be verified by calibrating them.
 

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Discussion Starter · #3 ·
Thank you for your reply. Yeah, I followed EI dosing strictly and do 50% water changes every week. I dose 3/4 tsb K2NO3, 1/4 K2SO4 tsb and 1/4 tsb KHPO4, 1/8 micro 3 times a week to 100 gal. My filteration is good I think. I use 2 Eheim 2217 for 100 gal tank. My tap water is normal. I added 10ml prime to get rid of NO, NO2. As long as there is no sign of problem, I won't measure these number. However, I do see some problems. There is something like staghorn apprear. Also some hard black film covers some of leaves. I doubt it is BBA. But I kept my CO2 level arround 30ppm.. 4-5 GH, 6.6 to 6.8ph. I just can't see where the problem is!

If you follow the EI dosing amounts and do 50% water changes every week, you can't build up that much nitrate or phosphate. I'm assuming your tap water is not abnormally high in either one. So, either you are dosing more than EI recommendation or the test kits aren't accurate, which can be verified by calibrating them.
 

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Even if you don't believe you cannot rise above 2x the weekly dosing, you can always do larger water changes every month say to flush out everything.

So that will lower things down and you can dose a little less also.
It's not written in stone nor was even meant to be.

Regards,
Tom Barr
 

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if your leaves edges and stems are turning black and it's not algae, it's overdosing on Nitrogen. I've had it happen. The leave will eventually die. this fits with your nitrate being over 60ppm... do water changes and hold back on the dosing for a while.

It depends on what and how much plants you have too... maybe the plants can't take up the amount of nitrogen you're puting into your tank. find the balance that fits your tank. That EI dosing thing is only a recommendation/guide, not rule of law.

nice tank btw.. no algae problem?
 

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Discussion Starter · #6 ·
I have quite a lot of java fern and Elatine trianda. I believe that they are always Nitrate hungry. I will stop EI for a week to see what it does. Thank you for the advice.

if your leaves edges and stems are turning black and it's not algae, it's overdosing on Nitrogen. I've had it happen. The leave will eventually die. this fits with your nitrate being over 60ppm... do water changes and hold back on the dosing for a while.

It depends on what and how much plants you have too... maybe the plants can't take up the amount of nitrogen you're puting into your tank. find the balance that fits your tank. That EI dosing thing is only a recommendation/guide, not rule of law.

nice tank btw.. no algae problem?
 
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