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I understand what you mean, now.
Unfortunately I don't know the answer. I have never had any fish do this during the last 35 years of using hyposalinity. I slowly lower the salinity to 11 to 12 ppt over a two or three day time and everything has been fine with the fish.
Could it be related to the food you feed them? or the possibility that they may have an internal disorder they shared with one another?
Sorry I couldn't be of more help. Maybe someone else has an idea or thoughts on this.
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