How to tell if a tank cycled?

Ghostyboythedog

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Hi,
I have a 20 gallon saltwater tank and I've had watering it for 4 days how can I tell that it's cycled and ready for fish?
 

Mr. Mojo Rising

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the ammonia would be zero and you would have some measurable nitrates. That’s when the cycle is done.

Are you testing? How did you start the cycle?
 
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