Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to treat cyanobacteria (blue green algae) in an aquarium [title] Perform a partial water exchange. [step] If your tank is harboring cyanobacteria, the first step is to replace the nutrient-rich water in your aquarium with clean saltwater. You can do this by performing a partial water exchange.

Ending1: Whether or not this tank contains cyanobacteria water is up to you. There are several ways to get rid of cyanobacteria by using this method. Ending2: If you have a tap with a hose in it, you can perform a partial water exchange. Always remember to tap some fresh, clean water into the tank with the hose, so that your cyanobacteria can't completely contaminate the water. Ending3: [substeps] Aim to remove and replace about 10% to 20% of the tank's water. In a 10 gallon tank, that means about one or two gallons, which should be sufficient to ensure healthy water. Ending4: [substeps] To ensure that your tank is completely clean and clear of any breeding parasites, ensure that the tanks water is clean for at least 30 minutes before feeding your jellyfish. [title] Fill your aquarium with fresh saltwater.

Answer format: ending1/ending2/ending3/ending4