Consider what doesn't happen to the the zoanthid's endosymbiont dinofalgellates(zooxanthelae) as zoanthidae tolerate fresh water dips well with no apparent loss . Hyposalinity might kill some dinoflagellates but it will kill lots of other isotonic organisms as well. Not all corals and other isontic orgaisms tolerate it well.
I've never heard of hyposalinity as a treatment before and wouldn't personally do fresh water dips on all new corals.Never heard of Pants and haven't seen his posts so it's difficult to evaluate the pass along information without context.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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