yes they are all ich free and I am currently raising the salinity after their hypo treatment. my powder blue tang is getting stressed from the salinity changes and it has me a little worried. I could use some advise on how to raise the salinity. I was doing top offs with salty water but it still seems to be a little much on the tang.
3-4 weeks after last sighting of visible ich is completely gone. Do not stress the fish with increase in salinity. The trip upward in salinity must be taken quite a bit slower than bringing the water down in salinity. If there is any stress, stop the change-outs for that day and start again slower the next day as long as all is well with the fish.
Yes, evap and replace with display levels salinity can do that very well and safely but depending on evaporation rate, that could take longer than necessary. Evaps in QT can be pretty slow compared to the evap in a well lighted reef tank.
If fish are in QT, then use the water from the display tank to bring up the salinity.