The Leptogorgia genus can be moderate to difficult to care for. They are aposymbiotic which means they do not carry zooxanthellae, so they must be fed regularly with zooplankton and other similar sized foods. Once 10% of their polyps have stopped feeding, death is immanent. They are easily over grown by algae, so a dim area of the tank is needed to keep them healthy. They cannot shed off their tissue like other gorgonians to rid themselves of algae, thus the need for water movement and low light.
These corals are best kept by experienced aquarists who have had success with other gorgonians. It has been noted that yellow specimens have done better in captivity than red ones. Yet they are an exception, in that they do need light. Buying a Leptogorgia gorgonian that has roots attached is your best bet. You must feed your Leptogorgia regularly for its continued health. (animal-world.com)