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Iron level

I have been dosing my 30-gal. tank weekly with Leaf Zone, the label of which
says it has 3% K2O and 0.1% chelated Fe.  After adding the fertilizer, my
Seachem test kit then indicates about 0.1 ppm Fe, which I understand to be
about the desired level.  I notice, however, that within a day or so, the
level has dropped to about 0.05 ppm or less.  So my question is:  Should I
still dose only once a week, or does this result indicate I may need to
fertilize more often?  Thank you.

John T. Fitch
E-mail: JTFitch at NOSPAMFitchFamily_com