Live corals are some of the most diverse and impressive marine species found within the marine aquarium hobby. While they do require excellent water conditions and require hobbyists to have a good understanding on how to maintain a quality marine environment, they are extremely impressive in appearance and variety. The appearance of many species of corals can vary dramatically depending upon their environmental conditions. Reef aquariums featuring live corals provide intermediate to advanced hobbyists with some the greatest challenges and rewards that a marine aquarium hobbyist can experience.