will Hypo salinity kill all the inverts in my tank ?

[DEAD_BY_DAWN]

so ive been useing the garlic method for treating my none QT tang (big mistake) for four weeks now,but it doesnt seem to be having any effect on the amount of ich on the fish,coppers treatment is out so i was looking into Hypo salinity as the next best thing i can remove the anthelia etc but will all my other inverts die if i try this ie all the small tube worms and iverts on the sand etc.