"Tasslehoff" wrote in message
u...
None of my local nurseries and gardening suppliers sell potassium nitrate
for my PMDD fertiliser. Can anyone give me any advice where to get it
from.

I bought mine from Chem Supply (www.chem-supply.com.au). It's about $30 for
500g of Lab Reagent. That'll keep you going for a good few years. While
you're ordering it, you might as well buy some potassium sulphate as well.

Is it okay if I make up the mixture without it.

Yes it is. I dose trace and macro separately, and have no problems.
Indeed, that's a good idea especially for the first few months, while you
get a handle on how much your particular tank needs. Your goal (for a
moderately planted, moderately lit, CO2 enriched tank) should be something
like 5-10ppm NO3, and 0.1ppm Fe.

If so what can I use in place of it apart from adding more fish?

Many of the commercially available aquarium fertilisers are suitable.

Regards,

Suzy

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Suzy Jackson http://www.suzyj.net