Crabs are an essential part of the Red Lobster menu, but they play an even more important role in quite the opposite way in the wild and even your aquarium. Some types of crabs are pure evil when it comes to reef friendliness, but others are amazingly beneficial. Some crabs even rely on the well being of certain corals to thrive. When you want crabs, get the kind that won’t irritate you. More: Reef Crabs: Not Someone Who Complains About The Holidays!