I too use (and prefer) Quick Cure.
I half dose Clown Loaches and had good results on more than one
occasion when bringing in new Clowns for quarantine.
The one time I tried RidIch (it was the proper one for sensitive fish)
and the Ich killed every single Clown before the med worked.
These Clowns had a light case of Ich and it got out of control *during*
the treatment with RidIch.
Never before have I had that happen with half dose Quick Cure.
In my time in the lovely hobby I've seen some pretty nasty diseases and
parasites come through my doors. Some would think I would have all
sorts of meds on hand. However, I have 3 things in my fishy medicine
cabinet.
Quick Cure (I always buy the tiny bottle....big bottle would go bad
unless you have a HUGE fishroom or store).
Jungle's Fungus Eliminator (works wonders with bacterial infections as
well as true fungus).
Salt. Sometimes you just need to salt those puppies down (depending on
fish type of course).
In all cases...no matter what you're dealing with...freshwater is
always a miracle worker.
Before doing anything.....the first thing I do in all cases would be to
do a water change.