These pseudo cures can be a deadly waste of time my friend, to kill cryptocaryon you need copper (in your case, in a QT---which as you have discovered is essential to your long term success in this hobby so set one up asap and use it) or starvation (fallow display tank, no fish for 4 weeks). Also, be advised some species (i.e. eels, puffers, moorish idols, etc.) are harmed by copper treatments so research your charges. Fresh water dips applied correctly when you move the fish to QT will kill parasites on the fish, but not the thousands lurking in your display substrate.
Try this to remove the fish:
try the double bag method; place a small sealed Ziploc bag with live brine inside a large rolled-op open bag, this will lure the fish into the big bag where they can be trapped/lifted by hand or fishing line wrapped under the rolled top. Patience required here; it usually fails the first few times. Run a search on Kick-ich over on WWM and you will find out how many fish have died while wasting time with it.