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Registered
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2,524 Posts
yes because the chlorine in your water is what kills nitrifying bacteria... if you dont declorinate, your tank wont even cycle!
 

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LionHart
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13,099 Posts
It won't begin to cycle until the chlorine is no longer present.
If you dechlorinate, the chlorine disappears instantly.
If you don't dechlorinate, the chlorine disappears in 24 hours.

It helps to leave your tank uncovered the first day or two to allow escaping of the chlorine.

Either way it's gonna cycle... just takes an extra day or so without dechorination.
 

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Nurses Do It Better
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10,000 Posts
Even though chlorine dissipates within 24 hours chloramines do not, so yes you need to add conditioner not only before the cycle but with every water change going forward if you have "city water"
 
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