How long do you typically QT? Replacing the two leopards can be tough with a longer QT period... depending on the size, they can start to change...
If a fish comes in and never shows signs of any illness, my quarantine time is usually about 3-4 weeks.
If I have to fight a disease then it goes much longer.
Most fish I quarantine I do the drip acclimation and then let them rest in a dark tank for 24 hours. I will add a little live food ( usually tigger pods) or cyclop-ese the first day.
Second day I turn a light on and do a couple feedings.
On the third day I dose the tank prophylactically with Chloroquine Phosphate.
Then after 10-12 days I do a week of Prazipro.
Then a few days of just watching them.
With the Leopard Wrasses, I found out them may not handle Chloroguine Phosphate very well, so I asked a wrasse guy I know on another board what he does for leopards and he said, first day nothing. Then do 24 hours of Methylene Blue, then carbon and water change. Then 2 rounds of Prazipro.
Then watch for a day.
I also read where some wrasse keepers say copper is hard on them too, so I wanted to avoid that.