I would do more than 10%. Probably more like 25%.

Ok, so I found my notes on the treatment. Raising the temp to 83 will not help you. The parasite lives to 85 degrees. Therefore, you need to at least get it to 86. You need to keep it there for 8-10 days. I would go all 10 just to be sure. Also, I used 3 tablespoons of salt per 5 gallons. Now I was treating ich with cichlids. You need to make sure your specific fish can tolerate that temp and that amount of salt. If they cannot then just do the medication thing.

Also, with that high of temp, you will be reducing the oxygen content in the water severely. Therefore, go out and buy several pumps, airline hose, and bubbling devices to use during this period of time.

There are some variants of the parasite that can live up above 85 degrees and that can live with salt so the method is not fool proof.

Does it look like little salt crystals on the fins and body of your fish? If so then it is ich.

that looks like the beginning of the ich infection, usually starts on the fins and works it's way on to the body, if the picture quality was better i would be able to tell, however it appears to be the issue. treat with the rid ich for 48-72 hours, generally the longer you treat for it the better, after the treatment make sure you vacuum your gravel very thoroughly so you suck up any of the remaining parasites that could be hiding down in there. it will be worth the time and effort for such a cute lil guy.

Brandon