Yeah that’s a bad case of ich. Gradually raise the temp to 86F (30 Celsius) and leave it there for 2 weeks. Vacuum the tank daily. You may want to add an air stone to help the oxygenation. Or you could treat with meds. But choose one or the other, don’t do both.
I would do water change yet let the salt and the heat do most of the damage as your only just pit it in if u do one now u’ll just take the salt put the water su could probably so a small one this evening but make sure u replace the salt as it will help.