I know that some will say absolutely yes, just because he's in there, or will say that he could have it and not manifest it. It's probably the most hotly debated topic on this forum, and some people believe even shrimp can 'carry' it.
Personally and completely honestly, if it were my fish, I'd treat the sick fish and the susceptible fish [tangs, rabbits, angels, damsels in descending order] in qt, leave blennies and gobies where they are and hope that the 'shrimp carry it' theory is wrong and that if it doesn't get a useful host it dies out in 6 weeks.
Immaculate water quality, particularly alkalinity, which affects skin comfort, is essential at this point. I've had ich in my tank---had it 3 months ago, removed, cured, and returned the susceptible fish, and have seen no trace of it since, running gobies, dragonettes, dartfish and chromis.
I have corals and maintain water quality for them, which I am sure helps. I do not have alk fluctuations due to constant buffering via topoff water. Other people with very good habits re their water have had very bad experiences, which point up the fact that sometimes you lose that bet. My own theory is that the size of the problem ich poses to a tank rests in which fish you choose to keep. Mine are all very tough in that regard.