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Re: Newbie Question

I have several aquariums.  One is a plant/fish tank.  I have been reading
the digest for a few days now.  There are several nutrient abreviations that
I am not familular with.  What is the meaning of PO4, KNO3, K2O, K2SO4 ?
Is there somewhere on the web where I can read about the proper use of these
elements or maybe a good book?