I put rocks from display that were covered by these PCPs into sump (no light in there) for almost 2 years and when I pulled them up to replace the rocks in display that were covered in these buggars, they never died!! Just went clear and came right back, covering the "new" rocks within a week!! dang, I hate these things...I am glad to see a similar thread to what I have been dealing with for years.
I would echo everyone's statement that if you do have this move quickly and kill them as fast as you can... they spread like wildfire.
Typically i have been re-curing rocks that get the scourge but also treating with a calk mixture applied for a prolonged time has had success for me in the past as well. Need to leave it on with no flow and then siphon it off.
Any other tips/tricks from others would be very welcome.