Be sure to soak the rock overnight in freshwater to kill worms and other invertebrate that use the rock as habitat. The next day, remove all worms and other invertebrates with tweezers. Let the rock air dry. Before any rock can be placed in a marine tank, every piece of barnacle, sponge, algae, sand coral, and other organic matter must be removed. Use an ice pick to chip away any remaining organisms. After cleaning thoroughly, bleach the rock as you did the shell, using the same proportions of water and bleach. Dry and test by smelling. If you have missed any of the organic matter, it should appear darker than the natural color of the rock. Reclean and bleach, if necessary.
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