Acropora carduus-The Thick Carduus is a unique SPS coral of the Acropora genus. The carduus species is known for its spiny, projecting branches. These appendages are often much thinner than other Acros commonly found in the hobby. This coral is a distinct addition to any intermediate level aquarist’s tank. Given that this species is typically found in deeper waters, we recommend moderate flow and moderate to low lighting.