I just thought I'd clarify something about live plants using ammonia as I recently had a discussion about it. Just in case anyone else gets into a discussion about whether plants use ammonia and someone decides to tell you they don't use ammonia(NH3) know that what plants actually use is ammonium(NH4). However what we actually refer to as ammonia in our fish tanks is the total ammonia nitrogen(TAN). The majority of the total ammonia nitrogen is actually ammonium(NH4). So if anyone decides to tell you plants don't take ammonia, they're actually refering to the less than 1% of NH3 that composes the total ammonia nitrogen in our ammonia test reading. just thought i'd clarify because I recently got into a discussion where someone very rudely told me plants do not use ammonia on another forum.