Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make a goldfish live for decades [title] Get the largest possible tank. [step] Do not use a fish bowl; at least 75 liters (20 gallons) is necessary to make quality life for a single fish. Choose a tank with large surface area to increase the amount of oxygen in contact with the surface of the water (wider is better than taller).

Ending1: [title] Set up the tank prior to the purchase of a goldfish. [substeps] Getting it ready may take four or more weeks. Ending2: Floating plants are also good choices as they provide plenty of light to give the fish some shade and room to grow. Avoid using a tank with a rain barrel, however, as this can rob your fish of sunlight. Ending3: Don't be too enlarge. Medium-sized tanks will probably have a brownish bottom, while large fish tanks may have a reddish bottom. Ending4: Also, if necessary, seal the area well with an industrial filter. [title] Make sure the water is shallow and does not stir.

Answer format: ending1/ending2/ending3/ending4