An optional choice that you can add is to put a rock into your opae`ula habitat. The first, step in making brackish water is getting half of a tea spoon of cinder. Next, put a little bit of fresh water and fake salt . Now you mix the water to mix the salt and fresh water. Then, get a hydrometer and fill it up with no bubbles so the spinner thing in it 1.1006. Now you can fill your rose jar (vase) with the brackish water you created today half way from the top. Lastly, leave your jar with your brackish water in ti out side in the sunlight for at least a week.
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