What inverts do you have at 1.0245? How are you measuring salinity?
Is this a reef setup?
I'm assuming it is a reef and you have no QT option. On other, reef-specific forums, how to treat ich is a huge controversy. I had a reef for over 2 years before my first encounter with crypto. I highly recommend a UV with slow flow. I added a 57 watt on my system and it has made a difference I believe. But I also did the following and my display is clear of the ich.
First, get Piscene Energetics M.Y.S.I.S. frozen mysis shrimp, some pure Spirulina flake, a bottle of Kent's Garlic elixer, Seachem's Metronidazole powder and Seachem's Focus powder, and Beta Glucan 200mg capsules. I also used a bottle of AP's Gel-Tek pX (more on that below.)
Second, mix the ingredients as follows: 1 spoonful (included) of the metronidazole and focus per TBSP of MYSIS. Add a pinch of the Sprirulina (assuming you have vegetarian fish in there, such as Tangs). Add about 1/3 of the contents of one of the Beta Glucan capsules. You can double or triple the recipe, probably a good idea. Cover this mixture with the garlic. I also added the Gel-Tek PX, thinking it would help the metronidazole to bind to the food. The focus is supposed to do that, but I was not convinced that the medicine would not just float off so I used the Gel-Tek, and used a tad less of the metronidazole. The problem is the Gel-Tek also includes praziquantel, which is a good medication against internals but probably can't be tolerated for as long as the metro can. So when I mixed the next batch I didn't use it. Maybe use it for one batch then not in the second as I did, or avoid altogether.
Anyway, use a tiny bit of RO water if needed to help dissolve all of this together, creating a thick paste-like mix. Spread it flat in a zip loc and freeze it.
Then feed small amounts to the tank 2-3x a day for a month. Yes, a month (thus the warning on the Gel-Tek!). I have seen no spots in the reef fish since day 8 of the feeding. I added the uv around the same time I began the feeding. I also fed to fish with ick in a QT with similar results.
There are a couple threads on Reef Central about this Seachem recipe (mine is slightly modified here).
Good luck. All of these items are reef safe and almost impossible to overdose (except, again, for the Gel-Tek though I believe the dose in there is small, better to be careful).