Fish diseases: Quarantine
To play it safe when adding new fish, it is sometimes a good idea to use a quarantine tank. For aquarium fish, the term ‘quarantine’ means keeping fish in a separate tank with its own equipment, generally for several weeks, so that the fish can be specifically monitored and treated. However, this involves a great deal of work. Fortunately, it is rarely necessary to keep fish in quarantine if they come from a single reliable source.
In fact, you should bear in mind that separating individual fish from your aquarium in the event of disease can even be counter-productive, as for most diseases the entire fish stock needs to be treated.
Quarantine tanks are therefore intended for ornamental fish wholesalers, specialist retailers, experts and fishkeepers who soruce their fish from numerous suppliers.