sarcophyton glaucum soft coral, head frag tentacle on coquina live rock stone , fluorescent animal absorb organic matter

leather coral mushroom toadstool alcyoniidae red sea indopacific capitulum stalk toxic anthozoa cnidarian octocoral aquatic biodiversity biology biogenesis fauna nursery stone environment underwater captive wildlife aggregation chumminess community lateral widespread salt saltwater aquascape reef tank aquaculture colorful flow tropical coralimorph decorative exotic coelenterates commensal encrusting external filtering controlled conditions pet shop glass refraction effect selective focus