| 摘要 |
PROBLEM TO BE SOLVED: To enlarge the space for allowing fish to swim by forming a ceiling plane through which the interior of an aquarium can be watched from an upper position, and fully filling the aquarium with water. SOLUTION: This aquarium 1 having the ceiling plane 3 through which the interior can be watched is characterized in that air-ventilation holes 9 are formed in the ceiling plane 3, side periphery planes are detachably separated to upper and lower parts 2B and 2A, and an air-feeding means to the aquarium is present.
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