Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to grow ulva algae [title] Obtain a piece of ulva algae. [step] To start growing ulva algae in your aquarium, you can go to a local pet store or order the algae from the internet. If you live near the coast, you may be able to find some ulva algae in the ocean and try growing it from that plant.

Ending1: [substeps] Never dig into the shells of fish because the shells could be poisonous. Only use old aquatic plants, as the shells will not take up any space at all in your aquarium. Ending2: [substeps] When you are looking for ulva algae to purchase, you may also want to look for sea lettuce, which the plant also goes by. [title] Grow ulva algae in nutrient rich water. Ending3: The important thing is that the algae in your tank is not too nutrient-rich, so it needs to be live. [substeps] Buy a piece of distilled water and pour some of it into the tank. Ending4: Consult your local pet store to find the right type of algae. [substeps] Tie your piece of ulva algae in its twine together with an elastic, rubber band.

Answer format: ending1/ending2/ending3/ending4