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Originally Posted by aquariumnewbie
Oh my god..... Well, I didn't do any major cleaning. Just water changes and that's all. It's such a horrible news to know it's undergoing a cycle again. Sigh.........
I wonder what causes it when I didn't tear down the whole tank. 
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sometimes you dont have to tear down a whole tank to end with a mini cycle.
I have found everytime that I have a mini cycling going is because I cleaned the tank too much. Sometimes the look of algae ridden decorations,plants and gravel get to be too much, along with the diatoms.. or just waste and decaying food. I will learn one of these days ...
Have you cleaned off all your plants and decorations at one time? Rinsed out or changed your filter media? vacuumed the gravel along with all the above?
Well... I have and every time.. no matter what, I end with a mini cycle and daily water changes til the ammonia is gone. But I always have some reading of Nitrates and zero nitrites at this time.
I have to keep in mind to only do a half tank of vacuuming at a time. Only one or two plants.... maybe one rock.. and I hardly ever change out the filter media or rinse them.
Also.. adding in too many new fish at a time can also raise your ammonia level and put you into a mini cycle. Same with using meds that destroy your beneficial bacteria will put you into a mini cycle.
After 14 days of daily water changes and loosing two pleco's.. a female GBR and a rainbow fish.. I think that I have learned my lesson...
Good luck with your tank.. and do keep up those daily water changes, they are a pain for sure, but just something that has to be done.