freshwater> general discussion> who uses quarantine
I'm sorry I can't link, I'm using mobile AA
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The answer to your question is as varied as the number of responses you get. If medicating, remove carbon from any filter.
People do QT all different ways from barren clear container to full alternate smaller tank.
For me, it would depend on sickness vs new fish. Type of sickness or potential health level of new fish. My holding tanks are fully stocked with cycled filters, rocks, plants, gravel... However, after those fish go to main tank. I'll be stripping one of them except to keep filter cycled with ammonia. After reading the other thread, I think the person posting that he used completely bare tanks to ensure he could observe the fish at all times and from all views made the most sense. Over time, since holding seems best for 6 weeks, I would probably add a small hiding place that could be cloroxed later.