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Deficiency disease?

Most of my java fern fronds have a problem.  They are fine at the base, but
turn progressively yellower towards the tip of the frond and the last
10-20% is translucent (as tho cell lysis had occurred).   Does anyone
recognize this as a deficiency symptom?   Of what?  I read Neil's post in
the archives but yellow leaves seems like a very common symptom.   This is
occurring in a very fast growing tank.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
FormMaestro                              <http://www.wcf.com>