Thanks,now I can do some more voracious reading:
Like this is interesting from Bob Fenner,especially the salinity part
http://www.wetwebmedia.com/ichartmar.htm
The Real Deal: Treating Fishes in Isolation, Allowing the Main System to "Go Fallow"
There are no "reef-safe" and effective treatments for crypt. NONE. Curing infested fishes involves separating them from non-fish livestock and treating them in that other system (or alternatively moving the non-fish livestock). Infested systems can be made "crypt-free" or better "crypt-virulence-reduced" by having them kept free of fish hosts for several
(4 or more) weeks without fishes. If practical, elevating temperatures and possibly lowering specific gravity (to the tolerance of other non-fish livestock) can be employed to "speed up" the loss of virulence of the parasites. In practical terms we are generally talking the low to mid 80's F. and 1.017-1.018... with these values adjusted over days time. Care must be exercised in not possibly transmitting disease organisms from the quarantine system... on nets, containers, hands... anything wet, and drying, otherwise sterilizing quarantine tanks and gear between uses.
A) Hyposalinity, lowered specific gravity. Some advocates place lower spg. as low as 1.009. This can work if your fishes are not too challenged already or the pathogen too virulent, however it will not effect a permanent system cure. Know that most common measures of specific gravity are temperature specific and that most non-fish livestock will not tolerate the lower limit (14-16 ppt salinity) necessary to kill off the parasites. Therefore your fishes will have to be separated from your non-fish livestock if you're using hyposalinity as a treatment mode. And there are exceptions, variations to consider using hyposalinity. Cartilaginous fishes (sharks, rays) cannot be treated in this fashion... and such osmotic changes need to be made gradually (over days).
Thanks again for the info