Anything that will actually kill ich will also kill any inverts like pods, hermits, snails, shrimp. It would also be difficult to do in a display tank because the rock/sand will be absorbing some of the copper which would make keeping therapeutic levels difficult. It can be done though. The other issue becomes that once you have treated for ich you have to remove any traces of copper before it would be safe for anything other than fish which can be done, but is difficult.
You might be able to use Chloroquine, although I've never heard anyone using it outside of a QT tank.