I have quarantined all new fish for the last 4 yrs. Here are somethings I've learned .....It's too hard to keep a bare tank cycled just in case you come home with an impulse bought fish. Besides if I have a tank with water in it, it ends up filled with live rock and other critters, making it useless to medicate fish if I need to.
For me, the best thing I've found is to use a small tank (10g) which I set up with tank water when I need it. I then do 25% water changes twice a day (3g water changes are quick and easy to do) to keep ammonia levels down.
Oh and every fish is automatically treated with cupramine for the first 2 weeks
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