Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to skim surface scum from your fish tank [title] Scoop out debris with a net. [step] Old fish food, waste, algae, and other debris can collect on the surface of the water. Using an aquarium net, gently scoop up waste from the surface of the water.

Ending1: Do this slowly so that you do not disturb your fish. Empty the net into a trashcan between each scoop. Ending2: [substeps] The amount of debris in the net, and the amount of time it takes to remove it helps make the process easier. If you are worried about big build up, you can use a yard mop to scoop up whatever remains and rinse it off on a clean, dry surface. Ending3: [substeps] You can use a dropcloth for this. You will wear protective goggles when you scoop and retrieve debris. Ending4: You do not need a limit to how much you can scoop out so as to avoid contaminating your tank. Avoid handling fresh water, fish waste, or other debris on the surface of your tank or found in a public aquarium.

Answer format: ending1/ending2/ending3/ending4