Even if the ich is not visible at the moment (no white spots or rapid breathing), the ich is already in the system, unfortunately, which means all current livestock (and future) and live rocks in the tank can and are carrying it. The only sure fire way to get rid of it is to leave tank fallow for 72 days, while treating the fishes with TTM, copper, CP, or hypo.
I'm about to set up my new tank and this is what I'm gonna do. Furthermore, consider QT so future additions won't get it.
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