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Nutrient Limitation

dave wrote:  >>>Diana's systems of course are sediment based and allow
the removal of BOTH N and P from the water column... a strong argument
for fertile substrates in my mind... of course you cant have non-rooted
plants under these conditions.>>>

One of the interesting points about Diana's systems is that she has high
levels of both N and P in the water column of her iron-limited tanks as
I understand it.  She doesn't do the water changes that would keep those
nutrients out of the water column and yet she has algae free tanks.

Cheers, Steve Dixon