will Hypo salinity kill all the inverts in my tank ?

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I would consider just maintaining optimum water quality, feeding well and allowing the fish to fight off the infection.

Of course I use quarantine with hyposalinity to prevent this problem in the first place but that is another topic.

I have doubts about whether any "reef-safe" remedies are really reef-safe, and also whether they are effective, as a reef tank contains a lot of organic material which might inactivate medications and provide a place for parasitic organisms to hide.