How long to quarantine sick fish

Hey guys,

I have a 75/91 display/total tank, just started stocking with LPS corals two weeks ago. I had a yellow mimic tang showing signs of ich, so I got him into a quarantine tank and have been treating him with quick cure for a little over a week now, and he's looking great, but was shooting to keep him in there for 2 weeks. However, I noticed today that my lemon peel angel was on his deathbed (lying there, not really swimming unless the clean up crew came to try and eat him), so I'm acclimating him now to my quarantine tank. My paranoia got the best of me and decided to pull my helfrichi firefish and candy striped hogfish out as well as it looks like they have white spots too.

Now for my question - since my quarantine tank is only 13 gallons, I wanted to know if it would be okay to pull the mimic tang early so that the quarantine tank doesn't get over crowded. I've looked online and can't find anything to make me confident to pull the mimic tang out and re-introduce him into my main tank.