Well i will tell you what my experience is and let you decide what you want to do. I personally dealt with this ich crap for umm month and half battling it with some stuff called ich gone from the lfs
. However at 20 bucks a bottle i was 40 bucks and not a single result of good came from this. I finally broke down and slammed the ich with copper and within a month every sign was gone and never came back. Although not sure if you know the following so just play along if you already now this. The reason for ich is stress on a fish from some aquarium source from temp to moving lr
around, also depends on what fish you have some more readily get and others do not. So if you go the copper way flow the instructions when adding, have a test to check levels to maintain safe levels, feed food soaked in selcon or garlic. These are immune system boosters. Try to use copper in another tank and not your main tank, if you do use the copper in the main tank get a couple of polyfilters after your treatment is done to remove the copper. Also continue soaking the food four the next three weeks at least. Make sure the tank remains completely steady as possible this is the only real way i feel to keep ich at bay. Always QT
any new coral/fish before adding them to the tank for 2 to 3 weeks. You will have to be judge of how bad the ich is, if its just beginning than you maybe able to just use immune boosters and stabilize the tank quickly to relive further stress. However if its covering more than 10% of the fish i would just go to copper to solve the problem. I hope i made this read able for you, and this is just from my experience and the problem i have is in a tank that is running for year and half with no issue of ich since month 2 when i did what i described. also i apologize for the big blob of info and how your able to read through it with out to much problem.
hope that helps