I'd drain 110 gallons (my tank is a 180) into my 2 barrels, and buy the cheapest closest used tank I could find on kijij for the rest of the water, then grab all my fish and put them in there + my 55g QT Treat them with copper for 30 days and then wait out the remaining 42 days before putting them back.
If this ever did happen I'd also qt all corals for 72 days which is the only thing I'm currently not doing to 100% ensure ich never makes it in.
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