| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in a conventional aquarium with a passage tube installed in an aquarium container, wherein the weight of water filled inside the passage tube is supported by legs and there is a case where the weight applied to the legs presses and damages a part of a bottom part of the aquarium container, and when air enters the passage tube to cause water inside the passage tube to flow out, the flowing-out water may overflow after filling the inside of the aquarium container.SOLUTION: A water tank 1 with a floating body is put in an aquarium 5, and an opening of the water tank 1 with the floating body filled with water is put upside down and lifted close to the water surface. The floating body is installed at the water tank 1 with the floating body so that the partially projecting state of the water tank 1 with the floating body from the water surface is maintained by the floating body. Aquarium fish can thereby be seen to swim inside the water tank with the floating body projected from the water surface and filled with water. When air enters the water tank with the floating body and water flows out, a floating body part allows the water tank 1 with the floating body to float on the water surface, and the water level of the aquarium 5 is lowered to prevent water from overflowing from the aquarium 5. |
