I use 82-84 degrees & K-salt to treat mine.
Higher temps bring out the ickies to the surface of the fish by giving the parasites a nitro boost. Once the adult parasites fall to the bottom, the eggs from the adults that will turn into baby icks can be destroyed with a concentrated k-salt water solution.
- Not sure how you would do that with a loach. I would remove the loach & treat him outside the main tank.
- Did you use the full dosage for the super ick cure for treating your ENTIRE tank?
- Did you also remove any decorations/driftwood & caves so the medication could get to all the surfaces?
- What kind of fish do you have in your tank?