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There is no longer need to piscine the fish out when you want to change the water in fishbowl.
With a piece of glass, this fishbowl consists of two parts but not completely separated. Fish can swimming on both sides freely.Every side have a water outlet, which can make the water in fishbowl flow end.
When you want to change the water in fishbowl, you can turn on the water outlet on one side. The fish can stay at the other side, after changed the water in one side, let the fish go to the cleaner side, then change the water in the other side using the same means.
South China Agricultural University