Quote:
Originally Posted by Belgian Anthias
Photoautotrops will use ammonia by preference and nitrite and nitrate as emergency nitrogen source, some cyno's have one more pathway and can take up nitrogen to produce ammonia bringing nitrogen within the organic carbon chain. They will only do so to survive, when no other nitrogen source is available. \
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I am not sure what you mean by an "emergency" nitrogen source, but many people feed nitrate to grow algae, clams, and corals. The organisms seem to do well enough. I also am not sure what you mean by "only do so to survive". Algae generally only do things in order to survive or reproduce. Ammonia probably will be taken up first. I'm not sure what relevance that has in this conversation.