Richard Sexton wrote:
In article .com,
steve wrote:

Richard Sexton wrote:

frankly it's easier to add potassium nitrate and test for
nitrates;
if you have any, you have potassium. in a tank with regualr water
changes
and enough dosing of kno3 to keep plants green you'll neevr run
out
of
potassium


This advice has caused me concern in the past, and seems
contradictory
to the "accepted" NPK ratio. If KNO3 is roughly 50/50 Nitrate to
Potassium, how do we get a 1:2 ratio N to K without adding
additional
K? Especially since we are adding additional N with fish food?


(you're adding phosphate with food, not nitrate)


Nitrate levels will not rise in a tropical fish tank as a direct result
of feeding fish? This seems contradictory to common knowledge.

steve