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[APD] Flourish iron & KH drop
I just started using Flourish iron &, after a while, I noticed that my plants had stopped pearling.
I have injected CO2 & 330W of CF lighting in a 50g.
I then noticed that, as I added a capful of Flourish iron, my pH dropped a little.
I tested my KH & found that, over a period of several days, my KH had dropped from 160ppm to 50ppm.
The reason the pearling had stopped was that my CO2 controller (set to pH = 7.3) was no longer injecting CO2!!
I added a few teaspoons of Sodium Bicarbonate to raise the KH & everything returned to normal.
I just did a quick test ...
My tapwater has a KH of 180ppm. I added 5ml of Flourish iron to 2L of tapwater & waited 30m.
The KH had dropped to 140ppm.
Has anyone else had this problem?
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