A heterotroph. Polyps (The actual living part of the coral. The hard rock like structure of coral is a by-product of the polyp's growth) within the coral use microscopic filaments drift in the water and catch phytoplankton that drifts past. This mainly occurs at night.
heterotroph
The viper-fish is a heterotroph.
Heterotroph
heterotroph
Heterotroph
heterotroph
Heterotroph.
heterotroph
heterotroph.
Heterotroph.
Autotroph
autotroph