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:help: I've been out of the hobby for about five years, but now back. I had some Potassium Nitrate, Potassium Sulfate and CSM plantex from back then and I've been using them in my current 29gal tank for EI method fertilization. I'm having a few problems with hair/thread algae and wondering; Does this stuff "wear out" or "go stale" when stored that long? It's been in sealed tupperware-type tubs and isn't clumped or discolored, and there is nothing obviously out of the ordinary, but.... Just wondering.
 
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