Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to replace a leaky aquarium [title] Clear the area. [step] You will need lots of floor space and an easy lift of the old tank. [title] Drain the tank, leaving about 10%-40% of the water, depending on number of fish and size of your tank and holding buckets.

Ending1: [step] For every 30 inches (760 mm) of fish no bigger than 7 inches (180 mm) you will need one 5 gallon (20 l) bucket. If this is not available, use anything that won't be too small or have harmful residue in it. Ending2: [title] Measure the tank and remove the pieces that came off. [step] Use a narrow black measuring tape to take all the pieces off, leaving just a 9 " square square at the very bottom of the tank. Ending3: [title] Ensure that all the water is completely drained out, this is vital in removing dirty water from the tank. [step] You will need to remove all the gravel to make room for your new tank. Ending4: [title] Take out the suction cups, always, and set them aside. [title] This step is optional, only takes a few minutes.

Answer format: ending1/ending2/ending3/ending4