Today is day 36 of Hypo salinity and Day 31 for No Spots/Signs of Ich. Happy to report that there is NO LOSS of fish due to Ich. Unfortunately last week, my Apex Temperature probe broke and that raised temperature to 90 F overnight causing my 10 inch queen angel/3.5 inch Flame and 3.5 inch coral beauty's demise. However, want to emphasis that the Hyposalinity works well. I had ammonia spike but that was due to a very large (5 inch) snail that I just forgot to take out as he kept hidden at the back near the black water column in my waterbox and he barely moves but with his death there was a lot of ammonia for a week in the beginning.
I am starting to now increase salinity over 4 days (in ten 5 gallon water replacements) back to 1.022 - 1.024 range.
I am so glad that this has worked for me removing ich parasite from my tank. My corals/anemones are doing well in the separate tank and they will be moved back in in another 14 days (i.e total 50 days of fallow water for the ich in it to be dead).
What temperature have your corals been held at? If below 81 degrees, you should probably keep them fallow for 60 days, just to be safe.
Jay