Re: Day 23 Nitrite appearing
Welcome back to the hobby, and thank you for using our products! As you know, the amount of time that it takes for a tank to fully cycle varies from tank-to-tank. It looks like you are in pretty good shape and are progressing in the cycle properly. I would not be afraid to do a weekly water change (maybe 10-20%).
I would continue adding Prime directly to the aquarium for the entire water volume every 48 hours until the cycle is complete, in order to keep those nitrites in a detoxified state and therefore unable to harm your fish.
Best of luck to you, and please let us know if you have additional questions. Have a nice holiday!