Neil Posted February 2, 2021 Share Posted February 2, 2021 I am just learning about this nitrogen cycle. Very interesting. Lets say you set up a new aquarium and added some plants (no fish yet). Would ammonia build up in that tank and start the cycle? Or is the only way to get ammonia in the tank (to start the cycle) is to add fish? So, I am asking if you just put some gravel and plants in an aquarium with a filter and heater would ammonia ever be present or would you never have ammonia in the tank? Link to comment Share on other sites More sharing options...
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