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I've been involved in a few discussions about this, and the result was that most people that have used urea have had absolutely no negative results. Positive results are pretty subjective, but I believe *technically* nirtrogen from urea is more readily available to plants, so again, *technically*, urea is a better option.

Why we all use KNO3, I don't know except that we all operate off that conventional wisdom that urea or NH4 will cause an algae bloom.

This is, of course, in plant only tanks.
 
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