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Re: Nitrogen deficiency ?

> Date: Mon, 06 Oct 1997 21:32:31 -0700
> From: Stephen Pushak <teban at powersonic_bc.ca>
> The nerves of the leaves are green and are surrounded by a light green
> area which fades to yellow at the leaf edges. At this time both old
> and new leaves are all affected similarly. I have removed several of
> the old leaves which had begun to deteriorate. At this point, I was
> pretty sure that I had either iron or nitrogen deficiency.

This sounds like a classic case of "Christmas Tree Disease" (the green
veins make the leaf look like a pine tree).  This indicates an over
abundance of a trace element that is blocking the uptake of another
trace element. I think the critical items are iron and manganese, with
high iron blocking the manganese. I think The Optimum Aquarium
discusses this.