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I am about to mix another batch of PMDD, and I have a few questions I hope
you folks can help me with.
I have a very coarse version of K2SO4. It was very hard to dissolve and
tended to precipitate again from the solution (either that or I was never
able to dissolve it that well), so it kept clogging the nozzle of my PMDD
squirt bottle before. I'm thinking of skipping that ingredient this
time. I would like to make up for it by adding more KNO3, since my nitrate
was always measuring 0 anyway. How much KNO3 should I add to add enough K
to replace the K2SO4? And am I right to assume that the S is not really
needed, but just there as a carrier?
Also, what are the effects of having too much Mg? Isn't Mg often a
component of hardwater? And if I have hard water, should I still use that
much MgSO4? Is MgSO4 still needed if I use the Microplex trace element mix
(it contains 5.4% Mg).
Hoa G. Nguyen
Freshwater Planted Aquarium: http://www.geocities.com/Heartland/Hills/2637/