I had an ich breakout in my tank about 2 years ago and chose to run fallow for 3 months. I did add coral and inverts during this time as a few people have said they aren’t effected by ich, but they can be carriers of the eggs. I ended up reintroducing ich to my tank via some coral frag about a month after adding the fish back in. Since then I’ve just managed it and now I don’t see it on any fish at all. You need to decide between management and eradication as Humblefish has put it and he has plenty of great articles on both. Like a few other people said, still dip and clean the corals, but if you aren’t quarantining absolutely everything going into the tank, there’s still a chance ich will be reintroduced in the future and the fallow could be for nothing