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Lead, an Important Nutrient?

    I was surprised to read in Amano's Aqua Journal #34, that he listed the 
"three main minerals" for aquatic plants as being " nitrogen, lead and 
calcium" !  I wonder if it is a translation error.  I've found mention of 
lead in the archives regarding it's potential toxicity in planted tanks, but 
nothing of it's role as a nutrient.  Amano's quality, and rate, of growth 
appear to me to be superb, so I want to carefully consider the information he 
    Since most use tapwater as their source water, they might be introducing 
some lead into their tanks on a regular basis.  I use RO purification on my 
tapwater, which I think removes the majority of any lead present.  I drive 
the plants pretty hard under pretty high light, and want to be sure I'm 
providing all they need to get the finest growth possible.  
      Does anyone have any input on this?  I wonder, at what levels is lead 
present in the water and substrates of our plants natural habitats?  And, do 
we have any descriptions of lead deficiency symptoms?  I would sure 
appreciate hearing about this.  I've never seen it listed in any aquatic 
fertilizer or reconstitution product, although they don't all list every 
ingredient.  If Amano lists it's importance on par with nitrogen and calcium, 
then perhaps it's something to consider seriously.

    Thanks Very Much,

    Zach K