Then a second type of bacteria breaks down the ammonia to nitrites, nitrites are also moderately poisonous to fish in small amounts. Lastly a third type of bacteria converts nitrites to nitrates which are not harmful to fish but build up to toxic amounts generally within a few months. That is why 20% water changes every both weeks is essential to healthy fish keeping. It generally takes a tank 21 days to cycle. During those 21 days the...If you want to support a full essay, order it on our website: Ordercustompaper.com
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