Yes.
The only 100% way to beat the ich is to remove all the fish and keep our DT fishless for 8-10 weeks. While your fish are in the QT I would treat with copper for 4-5 weeks and then 4-5 weeks with no meds. Any new fish should go into your QT for 4 weeks with copper. Also, anything "wet" needs to be in a QT before entering your DT, including; corals, inverts, rocks, etc.
If you don't want to do the above then you can just keep feeding the fish well and hope it builds an immunity to the ich. Any new fish you add to your tank has a good chance of picking up the ich because the stress of the new environment.
Ich is a huge pain but there are sure ways of killing the ich and keeping it out of your tank and that is by not allowing it to be introduced into your DT when removed.
I also feel your pain. I'm on week 3 :(