If it were me, I'd hold off a little longer before adding fish.
Seems a little conservative, but that's just my opinion. I can't disagree with anything designed to increase the safety of the fishies.
Anyway, I mentioned white clouds because I had a surprising experience with them. My brother had an outdoor "pond" last year with hordes of white clouds, and no place to put them at the end of the season. I ended up keeping them in my quarantine tank for a few months while he readied an indoor tank for them. The big day came, and we moved all the white clouds to their new home.
When I got back to my house, I changed the water, with ice cold (but conditioned) tap water, and added a 1/4 teaspoon of ammonia to the 10 gallon quarantine tank, just to keep the biofilter going. Perfectly safe since there were no animals of any kind in there now.
Two days later, I just happened to glance over at the quarantine tank, and there were 20-30 white cloud fry swimming in there!
I couldn't believe it. They (or their eggs) had survived 50 degree tap water, and dosing with ammonia. Hard. Core. Fish.
I raised these stalwart fish to maturity and they now live at my brother's house.