Heavy Duty Specimen Container. Lees Aquarium and Pet Products. Break resistant multi-purpose clear container used for holding tank treatment tank or for observation of fish. As a treatment tank it requires less medication than an aquarium. Hang on inside of aquarium to utilize the benefits of the aquarium heater. One Wide handle is used for hanging on aquarium. Recommended for store fish room use. Size: Small. Dimensions: 5-1/8 L x 2-1/2 W x 4-1/2 D.