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Nitrogen also lingers in the aquarium a little longer than the other forms. Some plants have a little bit of a hard time absorbing nitrates vs. urea or ammonia.

It makes more sense to dose all three forms in very low levels. If you look at nearly all garden fertilizers they always have a combination of all three compounds for best results. Just make sure that the total N level doesn't exceed the needed N level if you decide to dose.

I believe freemann has been dosing ammonia for a long time now without problems.
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