Quote Originally Posted by Reefer4ever View Post
I'm pretty sure that ammonia, nitrite, and nitrate can all be cycled out of a saltwater ecosystem? I think saltwater environments have little critters that freshwater can't contain, so freshwater only allows ammonia and nitrite to be converted into nitrates? Are one of the "little critters" that I'm talking about rhizobium?
no, rhizobium is a bacteria that live on the outside of the roots of some plants. it takes inorganic nitrogen "fixes" it so that it is now organic nitrogen and that the plant may consume this and use it as building blocks for growth

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