When quarantining I find it helpful to keep a sponge in the sump of the display tank to be ready and "seeded" for when I need it.In your case it is too late so I would do large water changes to keep the ammonia down until the proper bacteria set up house.
The live rock is probably not a good idea because the pods and worms in it can't take the lower salinity and will die, creating more ammonia.
You could also try using Cycle its supposed to contain the bacteria needed to cycle a tank.
Are you quarantining your other fish as well? The display tank should now ideally be kept fishless for the next 6 weeks to kill off any ich in there
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