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> From: "Hopkins, Samuel" <Samuel.Hopkins at marconi_com>
> Subject: NO3
> My plants are starting to turn black/brown/transparent and die and I thought
> I might be short on a trace or K2SO4. However I just read an article that
> stated if NO3 is 0 then trace and K2SO4 are fine because plants are
> consuming it. (I do have fish that provide plenty of NO3 so if I ripped out
> all of my plants my NO3 would sky rocket). My light is 3W/gallon and my NO3
> levels are now 0.
I operate with more or less that philosophy - if NO3- is being used
up then everything else is there. If it isn't being used up, then I add
K2SO4, trace elements or K2HPO4 depending on what I think is running short.
My inclination, with your tank now would be actually to add some KNO3
and make sure it _is_ being used. I would first check my NO3- kit with
a known sample, just to make sure the concentration in the tank _is_ zero.
Paul Sears Ottawa, Canada