[APD] When to add potassium

[Aaron Steiner <steinish at adelphia_net>]

I have a fairly new planted aquarium and my wife just treated me to a 
bunch of Seachem products.  Substrate is flourite/eco-complete/moon 
sand fertilized with flourish tabs (overkill?).  I have been dosing the 
tank the past month with Flourish and Flourish Excel in addition to my 
piss-poor DIY CO2 set-up — I'm only getting about 6 bubbles a minute.  
I just got an iron test and after reading no iron in the tank, I have 
started adding that.  My question is, I was also given a potassium 
supplement but have no way of measuring levels currently in my tank and 
if it is needed or not...and if so, at what levels?  Are there signs 
the tank will give me that there is a shortage of K2O?

Be gentle with me....I'm a wicked newbie!

Many thanks.

Aaron

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