You will have to treat them ... ich does not go away by itself ... I suggest to treat with hyposalinity ( better than the copper on the digestive tract ) and leave main tank fallow for 6 weeks ... do 10% water changes at once a week ... leave at 1.009 sg then over 3 or 4 days at the end bring the sg back up to 1.026 or whatever you normally run at ... if you have a refractometer great ... if not then calibrate whatever you are using against one ...
Good Luck ... it will be all over and back to normal before you know it
Cheers