Reef safe is a distinction used in the saltwater aquarium hobby to indicate that a fish or invertebrate is safe to add to a reef aquarium. There is no fish that is completely reef safe. Every fish that is commonly listed as reef safe are species that usually do not readily consume small fish or invertebrates. Fish listed as reef safe also do not bother fellow fish unless in some cases, for instance tangs, they do not get along with conspecifics and sometimes fish with similar color or body shape. Every fish has a personality, is different, and, in some cases, are opportunistic feeders. Tangs, which by most accounts are reef safe, may in adulthood eat some crustaceans shortly after they molt. Many larger predatory fish, for instance eels and pufferfish, will adapt very well to a reef tank and will be problem-free as long as they have sizable tank-mates and no crustaceans. Some aquarists have also had success in keeping smaller fish with predatory ones in reef tanks by adding the smaller fish at night, sometimes with newly rearranged rockwork. Reef safe Fish Anthias Basslets Blennies Excludes fang blennies. A few species will nip at polyps and giant clam mantles. Cardinalfish Chromis Clownfish Excludes the maroon clown which can grow very aggressive and territorial. Damsels Excludes larger, more aggressive Dascyllus varieties. Dwarf angelfish Dwarf angelfish in a reef setting has been heavily debated. Dottybacks They may consume small shrimp and can be highly aggressive. Dragonets Foxface Foxface and rabbitfish will occasionally eat certain corals if underfed. Gobies Jawfish Pipefish They can be killed by stinging corals and anemones. Pseudochromis They may consume small shrimp and can be highly aggressive. Seahorses They can be killed by stinging corals and anemones. Tangs Wrasse There are both reef safe wrasses and ones that are notorious for killing small fish and invertebrates. Planktivorous Triggerfish With caution. Melichthys spp. Xanthichthys spp. Odonus spp. Invertebrates Corals (Class Anthozoa) There are aggressive types of coral which have sweeper tentacles that can burn other corals. These may require specific placement in an aquarium. Crabs Specifically small hermit crabs, anemone crabs, emerald mithrax crabs, and strawberry crabs. Fan worms (Suborder Sabellida) Giant clams Scallops Sea anemones (Order Actiniaria) Anemones, especially carpet anemones can eat fish and burn corals to death requiring specific placement for specimens in an aquarium. Sea cucumbers Sea fans Sea slugs Starfish / Sea stars