Lee's Specimen Container - Large, Multi-Purpose Aquarium Holding / Treatment TankLees Specimen Container is a 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. Observation container Medication and transfer tank Seclude weak or injured fish Small Specimen Container 5. 15 L x 2. 5 W x 4. 5 H Large Specimen Container 7 L x 3. 25 W x 6 H Hang on inside of aquarium to utilize the benefits of the aquarium heater. One inch wide