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Nitrifying bacteria is actually Nitrospiros spp.

Ammonia = NH3 (greater % of ammonia in higher pH water, and this is the one that is more toxic to fish in part because they cannot keep it out of their system)
Ammonium = NH4+ (greater % of ammonium in low pH water, and this is less toxic)

Most aquatic plants prefer these. (I am not sure if they can use one or the other better/faster/ or not at all)

Plants can also use nitrite and nitrate. (NO2 and NO3) but most plants prefer ammonia (or ammonium?)

Lots more info in Diana's book. Very thoughtful of you to order more to share with friends!
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