QT salinity?

[Bowtank]

In my area(in uk) it's pretty hard to find any fish that don't have at least a few ich spots, so i was wondering about keeping the salinity in my QT at 1.015 then lower it to 1.009 when i have 2 or 3 in there, then i can QT several fish at a time and reduce chances of stress and conflict when stocking my display, i know the LFS keeps theirs at 1.021.

If i acclimatize very slowly should this be ok?

Qt is 100g's

cheers

[hystrix]

I have quarantined fish at 14ppt for over a month with no problems. There are fish though that can not tolerate the lower salinity. I started with normal salt levels 34-35ppt. and lowered it 3-4ppt a day until I reached the level I wanted.
Indopacific fish tend to be more sensitive to lower salinity, but with that said the fish I QT at 14ppt were hepatus tangs, blue damsels, flame hawk fish, and various butterflies. the quarantine won't be effective unless they are kept at treatment level for 28-30 days.