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Many people like keeping some fishes in workspace. They put the tank on the desk and observe fishes swimming, enjoyable. To keep the water in fish tank clean and full of oxygen, people need change the water every two days. It is so troublesome that we need use the tuck net to scoop the goldfish or use water aspirators to draw the dirty things out to another container. The new fish tank is easier to operate. Its high side is full of holes, through which water can flow, but goldfish can't. To change water, just incline the tank, let original water outflow and refill the fresh water. It’s suitable for keeping a small number of fish.
Beijing Institute of Technology
Shang Mei, Wang Shu, Yuan Shangxue, Lin Yuxian