- 1). Fill a large plastic container or bowl with 5 cups of cold water. Remove each piece of coral from your aquarium and check it for any hidden fish or other sea life.
- 2). Place the coral in the container or bowl and turn each piece three to four times to release any trapped air bubbles. Pour 1 cup of non-fragrance chlorine bleach into the container or bowl and stir the mixture by moving the coral around.
- 3). Let the coral soak for 2 hours. Add an additional cup of bleach to the container or bowl if the coral is still dirty. And then let the coral soak an additional 2 hours.
- 4). Remove coral from the solution and rinse it thoroughly under cold running water. Pour out the bleach solution and wash the container or bowl with running water.
- 5). Fill the container or bowl with 5 cups of cold water and 1 capful of a dechlorinating solution -- available at pet supply stores. Place the coral in the container or bowl and turn each piece every 15 minutes for 1 hour to remove the chlorine solution and any trapped air bubbles.
- 6). Remove the coral from the container or bowl and place it on an old towel. Let the coral air dry for 3 to 4 hours and then return it to your aquarium.
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