Life after Ich

[likwid]

Hey guys,

I bought a fish that apparently had ich, which died shortly after being put into my tank. I then noticed my other healthy fish that I have had for many months had ich as well. That fish died today. Looks like I'll be setting up a QT from now on. Anyways, before adding any more fish, will I have to treat my tank for ich before adding another fish now? My tank currently has a bunch of snails, emerald crab, coral banded shrimp, hermits, and a bunch of corals. Will these medications hurt my corals? I would like to use the fastest med and most reef safe.

Thanks