As newbie on this procedure did suffer one mortality, only two fish as nano cube, even perhaps other stress going on. Looks like Ich. Lost a fish on 4th day of procedure. Likely went too fast on salinity drop. Will say the honey Damsel left is incredibly hardy, my bicolor not as well. Will be more cautious on using this method in future, thanks all for the feedback.
I'm going to continue with a different method, was so disappointed with a fish loss raised the salinity quickly, Damsel didn't even blink, replaced the removed invertebrates as they will not have a chance at such a low salinity.