Richard Sexton wrote:

In article ,
Nikki Casali wrote:

Can anyone recommend an online website where I can obtain LaMotte's
Potassium Test Kit #3138? Forget the UK. I'm interested in outlets in
the US so that my brother in SF can possibly obtain it.


ebay?

frankly it's easier to ass 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


I can't get NO3 to lower than about 8ppm on a very good day. I've never
added N directly to any of my tanks. On the other hand, PO4 seems to be
sucked away as if there's no tomorrow. I have to add PO4 every few days.
I'm not sure what's going on with K, but I do add K2O, haphazardly. I
need something to initially gauge what's going on with it so that I can
create a dosing regime.

What is the ratio of P to K uptake? That could possibly work if I take
into account that food has a certain amount of P.

Nikki