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Once you start mixing different fertilizers together, you may run into unsuitable element ratios.
The CSM-B and Plant-Prod® Chelated Micronutrient Mix http://www.plantprod.com/catalogue/04Micronutrients.html
are the same, well balanced trace element products supplying plants with all traces they need. Traces are about the right ratios, not about levels.
Why do you think you need more Fe?

Edward
 

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chrisl,

The best way is to find out what is in your tap, GH, KH, pH, Ca and Mg, then your aquarium KH, pH, NO3, PO4 and CO2.

Edward
 
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