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Any iron test kit news?

I've recently taken up the PMDD torch in my new 46 gal planted tank 
and wanted to try to test for iron in order to obtain the .1mg/L 
appropriate concentration...  I went through the actwin archives of 
this list looking for advice and really couldn't find anything 

Many articles listed the Lamotte as the best, but others said that it 
couldn't read EDTA chelated iron (such as that in my PMDD trace mix), 
which makes it pretty much useless...

Other articles listed the similarly priced Hach (?) kit as the best 
and seemed to indicate it MAY read chelated iron...

This is a pretty big investment so what should I do???

Chris Schmelzer, M-2
Medical College of Wisconsin
Milwaukee, WI USA

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