Do you have any inverts, corals, LR
in your tank? If you do, DO NOT put any copper into the tank, it will kill your inverts and will never come out of the sand or LR
. In fact, i would avoid treating your main tank with copper all together. You should set up a QT and treat them in there.
Feed them sparingly with garlic saoked food. The garlic will help the fish repell the little buggers.
Im not sure why you dropped your salinity to 1.017? If you are going to use Hyposalinity (do a search he on AA for Hyposalinity), you will need to bring your SG
down to 1.09 over several days and keep it there for 3 or more weeks. Too much of a change too fast causes stress and can kill your fish. As with copper, treating with Hyposalinity should be done in a tank with no inverts, it will kill them.
To speed up the ich's life cycle, i would suggest bringing your Temp up to 84F slowly over then next few days. Again, too much of a change too fast causes stress and can kill your fish.
Do a search for Ich, Ick, Hyposalinity or Copper here and you will find lots of posts on this subject. HTH