||This article needs attention from an expert on the subject. (May 2010)
The quarantine 
The goal of quarantine is to prevent problems in the main tank due to sickness. A quarantine tank should be used before to introduce any newly acquired animals in the main tank and to treat fish that are already sick. By doing this, the aquarist can avoid the spread of the disease and make it easier to treat the fish.
External links 
- ^ http://www.aquariumslife.com/freshwater-101/how-to-quarantine-aquarium-fish-and-invertebrates/