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Welcome to the forum......
What size tank, type of filter, any live plants, water temp, pH, stocking level, type of substrate and do you have a test kit.........if you have live plants-type of lights and photoperiod......can you post a pic......
The nitrogen cycle isn't as complicated as it sounds once you understand the bacteria to meet its needs.......it needs- surface area, oxygen and food to thrive and colonize.....as BettaMiah posted....in small filtered tanks under 5gals..... its not that a filtered smaller tank can't cycle...its more due to limited surface area that limits the stability of the nitrogen cycle and nitrifying bacteria colony....
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