treating ich

at the moment im only doing a 'FOWLR'. i have been dealing with a moderate case of ich and need a little advise.
125 gallon temp. set at 84
Day 1: a 20% WC and dosed with kortons rid-ich
Day 2: another 20% WC and dosed again with rid-ich
Day 3 (today): another 20% and again i dosed with rid-ich
Results: After losing a yellow tang and a couple damsels all other fish seem to be doing ok. all are eating well and are active but im still noticing a little scratching of the rocks.
Tomorrow: Should I do another WC then dose again or should i just do a WC and keep the temp at 84 for a couple more days?
instructions state to dose for 3 days. directions state to those for three days. any advise is greatly appreciated.
 
The best way to treat Ich is to forget about it and focus on your water qaulity, and other equipment to get your tank to near perfect Sea conditions. When you achieve this my friend you will truly forget about Ich. good luck
 
+1 with Matt. I would try to put the fish in a hospital tank if possible and treat with copper. If you can't you could try boosting the fishes immune system by feeding them garlic supplement with their food and watch the waters parameters to make sure nothing is adding more stress on them.
 
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