Cycling finished in a week?

[ElsaGamino]

Hi, it’s been at least 2 year since I’ve had a saltwater tank so I’m wondering if it’s possible to finish a new tank cycle in a week? I have an Innovative Marine 20g with one clownfish. I setup the tank on Sep 16th 2021, I used instant ocean live nitrifying bacteria. Today Sep 21st I’m reading 0 ammonia and 0 nitrites around 10-20 nitrates. The first picture is one from Sep 21st and the second is from the night before is this possible? And what should I do after, should I do a water change or continue to wait?

[PeterU]

Did you start with cured live rock?

 

You shouldn't have put fish in there until you were sure the cycle is complete.

[rough eye]

looks cycled to me. and yeah, if there's already a fish in there it's kind of a moot point isn't it?

[ElsaGamino]

4 hours ago, PeterU said:

Did you start with cured live rock?

 

You shouldn't have put fish in there until you were sure the cycle is complete.

I had dry live rock that I cured for a week prior to starting the tank, and I was told and have read that it is okay to start with a hardy fish to help start the cycle.