If you don't wanna stress your fish then just keep them in the display tank and feed them good, Try to keep your hands out of the tank(besides feeding) until they get better, That's the best method for treating ich and it doesn't stress the fish at all like all those other methods will, You will get many opinions on this subject trust me lol,I use to do all those other methods mentioned and my fish just stressed more and died then some long time reefers gave me some advice and it was to just leave the fish alone and it will be fine, Ever since Iv done that I have never lost a fish and never stress about ich at all, It's really easy for a fish to fight ich off but when you start trying to catch him and take him out of the tank then it just makes things worse imo,like I said you will get many opinions just research deep and find out what works for you