I will begin moving to a new place this weekend and I have a couple weeks to complete the process (the time is finally here, Nancy and Loach).

I currently have a 55 gallon aquarium setup and these inhabitants will eventually be moved into a 120 gallon. I also want to add more loaches and a large school of some kind of tetra or barb. But I want to quarantine the new fish. It would be easier to use the 120 as the quarantine so I only have to move one batch of fish. I originally planned on moving my current fish into the 120 and using the 55 as the quarantine but then I have to re-bag and move those fish too once the quarantine is over. If I put new fish directly into new tank then I only have the stressful job of catching and moving only once.
For the quarantine I plan to dose with Prazipro then wait a couple weeks, then deworm with Kusuri. Should I do something else as well?
So my big concern is will my current fish be safe if I add them into an established treated tank? I want to do what’s best for my current fish but I also want to decrease my stress level too. Please let me know your experiences and advice. Thanks all.
Fran