I actually just got my 25 gal hospital tank going to treat one of my tangs that came down with ich, from my recent move. :x
I don't keep a hospital tank running, I just take existing tank water and fill the h-tank with that. The copper treatment is going to kill whatever is in the water column anyways, so I don't waste time cycling it.
I think it's a good idea to have a small empty tank sitting around for just that purpose.
Mitch
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