[konaevent]

Warnings

Invertebrates, sharks and rays cannot tolerate low salinity and should be removed from the tank.

Temperature affects specific gravity and must be considered.
pH can drop during treatment and must be monitored.
Summary
Isolate the fish from any invertebrates or sharks and rays
Lower the salinity (specific gravity) to 12-14ppt (1.009 @ 27°C) over a 72 hour period
Closely monitor the pH and specific gravity
Do regular water changes with low salinity water
Keep the salinity (specific gravity) at 12-14ppt (1.009 @ 27°C) for 4-6 weeks, or at least 4 weeks after the last disappearance of the "Ich".
Raise the salinity to normal over a 3-7 day period.
Leave an untreated display tank fishless for at least 30 days.
Disclaimer

This information is presented in good faith to assist aquarists in the treatment of "Ich" and other conditions in their fish. The author accepts no responsibility for loss due to the use or misuse of the information.

References

Colorni A. 1987. Biology of Cryptocaryon irritans and strategies for its control. Aquaculture 67(1-2):236-237.

Gross, M. G. 1972. Oceanography: A View of the Earth. Prentice-Hall, Inc., Englewood, NJ, USA. 497pp.

Schmidt-Nielsen, K. 1975. Animal Physiology: Adaptation and Environment. Cambridge University Press, London, UK. 699pp