Colt CoralHow to Care for Colt Coral written by Dave Burr Colt Coral are fast growing and easy to keep in the home aquarium. They are easily distinguished from Leather Corals by their slimy texture which is similar to a wet bar of soap. They will sway back and forth in the currents beautifully as they filter food from the water. Rinse: This coral will slime during shipping. Make sure to rinse it off in saltwater before placing it in your display aquarium.