questions about EI values - The Planted Tank Forum
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post #1 of 1 (permalink) Old 07-07-2019, 12:52 AM Thread Starter
Algae Grower
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hello. I just want to ask a few things about the fertilizers.
Firstly i post my today's measures.
NH4= 0
NO2= 0
Fe= 1
NO3= 25
PO4= 0,4
K= 20
Ca= 20
Mg= 21

i add weekly
fertilizers KNO3,KH2PO4,K2SO4,CSM+B,Fe13% EDTA
I do every 7th day 50% water change.

Although i add only 11 ppm of NO3 i always have over 20 ppm in my tank. i believe is because of feeding and fish waste and some from water change. When i read in forums all say to add 20-30 ppm of NO3, it means only with fertilizers? Or i check for nitrates in my tank and add the rest with fertilizer to reach my target of (20-30)ppm?.

The second.. Although i add only 12,73 ppm of Potassium i always ended up with 20 ppm. Even after my 50% water change. I tested my change water and i didn't had potassium in it. i had the feeling that something is blocking the K uptake. what's might going on?

one photo of my tank
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Last edited by Darkblade48; 07-07-2019 at 09:54 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
fitos100 is offline  


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