Freshwater dip in my opinion is definitely a No-no. As a matter of fact, even my "do the hypo in the display" advise is a No-no, especially if you have lr
. I was just desperate.
However, a freshwater dip is a sudden change in EVERYTHING water-wise and may stress the specimen to death. You're really risking the specimen itself.
With that said, I've read of people doing dips and pulled through. Maybe they're just lucky, who knows.
Try to erradicate c. irritans from your display. QT
-ing everything out of the display will starve the c. irritans of host and will eventually cause the erradication. Or, if desperate, gut it out and do the hypo in the main tank. That should be the last resort. Hopefully you'd even consider it as the last of the last resort. :|