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Lee,
You can find this in Diseases of Aquatic Organisms Vol 1: 19-22, 1985 by Colorni.
"Most of the trophonts whose hosts had undergone hyposalinity treatment, including freshwater, for at least 18 hours, were still alive and occupied the same position in the host by the end of the experiment, following re-adatation to sea water. They later dropped from the fish, encysted, and the tomonts produced tomites."
HTH,
Terry B
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Knowledge first.
A large water change can cover a multitude of sins against your aquarium.
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