Reef safe is a distinction used in the saltwater aquarium hobby to indicate that a fish or

invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...

is safe to add to a

reef aquarium A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriatel ...

. 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

conspecific Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organ ...

s 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 Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean gr ...

shortly after they molt. Many larger

predatory Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill t ...

fish, for instance eels and

pufferfish Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species variously called pufferfish, puffers, balloonfish, blowfish, blowies, bubblefish, globefish, swellfi ...

, 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 Anthias are members of the family Serranidae and make up the subfamily Anthiinae. Anthias make up a sizeable portion of the population of pink, orange, and yellow reef fishes seen swarming in most coral reef photography and film. The name An ...

; Basslets ; Blennies: Excludes fang blennies. A few species will nip at polyps and

giant clam The giant clams are the members of the clam genus ''Tridacna'' that are the largest living bivalve mollusks. There are actually several species of "giant clams" in the genus ''Tridacna'', which are often misidentified for ''Tridacna gigas'', th ...

mantles. ; Cardinalfish ; Chromis ;

Clownfish Clownfish or anemonefish are fishes from the subfamily Amphiprioninae in the family Pomacentridae. Thirty species of clownfish are recognized: one in the genus '' Premnas'', while the remaining are in the genus '' Amphiprion''. In the wild, ...

: 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. ;

Dottyback The dottybacks are a family, Pseudochromidae, of fishes which were formerly classified in the order Perciformes, but this has been revised and the family is regarded as of uncertain affinities, or '' incertae sedis'' within the Ovalentaria, a ...

s: They may consume small shrimp and can be highly aggressive. ; Dragonets ; Foxface: Foxface and rabbitfish will occasionally eat certain corals if underfed. ;

Gobies Gobiidae or gobies is a family of bony fish in the order Gobiiformes, one of the largest fish families comprising more than 2,000 species in more than 200 genera. Most of gobiid fish are relatively small, typically less than in length, and th ...

; Jawfish ;

Pipefish Pipefishes or pipe-fishes (Syngnathinae) are a subfamily of small fishes, which, together with the seahorses and seadragons ('' Phycodurus'' and '' Phyllopteryx''), form the family Syngnathidae. Description Pipefish look like straight-bodied se ...

: They can be killed by stinging corals and anemones. ;

Pseudochromis ''Pseudochromis'' is a genus of fish in the family Pseudochromidae found in Indian and Pacific Ocean. Species There are currently 71 recognized species in this genus: * '' Pseudochromis aldabraensis'' Bauchot-Boutin, 1958 (Orange dottyback) * ...

: They may consume small shrimp and can be highly aggressive. ;

Seahorse A seahorse (also written ''sea-horse'' and ''sea horse'') is any of 46 species of small marine fish in the genus ''Hippocampus''. "Hippocampus" comes from the Ancient Greek (), itself from () meaning "horse" and () meaning "sea monster" or " ...

s: They can be killed by stinging corals and anemones. ;

Tangs TANGS is a department store located on Orchard Road in Singapore, owned by C.K. Tang Limited. The store is regarded as a principal shopping destination in the city, comparable to Bloomingdale's in New York City and Selfridges in London. The co ...

;

Wrasse The wrasses are a family, Labridae, of marine fish, many of which are brightly colored. The family is large and diverse, with over 600 species in 81 genera, which are divided into 9 subgroups or tribes. They are typically small, most of them ...

: 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 The Redtoothed triggerfish (''Odonus niger'') is a triggerfish of the tropical Indo-Pacific area, and the sole member of its genus.Matsuura, K. (2014): Taxonomy and systematics of tetraodontiform fishes: a review focusing primarily on progress i ...

'' spp.

Invertebrates

;

Coral Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secre ...

s (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 crab Hermit crabs are anomuran decapod crustaceans of the superfamily Paguroidea that have adapted to occupy empty scavenged mollusc shells to protect their fragile exoskeletons. There are over 800 species of hermit crab, most of which possess an a ...

s, anemone crabs, emerald mithrax crabs, and strawberry crabs. ; Fan worms (Suborder Sabellida) ;

Giant clam The giant clams are the members of the clam genus ''Tridacna'' that are the largest living bivalve mollusks. There are actually several species of "giant clams" in the genus ''Tridacna'', which are often misidentified for ''Tridacna gigas'', th ...

s ;

Scallop Scallop () is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops. However, the common name "scallop" is also sometimes applied to species in other closely related familie ...

s ; 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 cucumber Sea cucumbers are echinoderms from the class Holothuroidea (). They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide. The number of holothu ...

s ; Sea fans ;

Sea slug Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are gastropods, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary ...

s ; Starfish / Sea stars: There are many starfish which are not reef safe like

crown-of-thorns starfish The crown-of-thorns starfish (frequently abbreviated to COTS), ''Acanthaster planci'', is a large starfish that preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns starfish receives its name from venomous thorn-like spine ...

and chocolate chip sea star. ;

Shrimp Shrimp are crustaceans (a form of shellfish) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata of the decapod order, although some crustaceans outside of this order are refer ...

Peppermint shrimp Peppermint (''Mentha'' × ''piperita'') is a hybrid species of mint, a cross between watermint and spearmint. Indigenous to Europe and the Middle East, the plant is now widely spread and cultivated in many regions of the world.Euro+Med Plantba ...

s, cleaner shrimps,

pistol shrimp Alpheidae is a family of caridean snapping shrimp, characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound. Other common names for animals in the group are pistol shrimp or alpheid ...

anemone shrimp Hippolytidae is a family of cleaner shrimp, also known as broken-back shrimp or anemone shrimp. The term "broken-back shrimp" also applies to the genus ''Hippolyte'' in particular and "cleaner shrimp" is sometimes applied exclusively to ''Lysmata ...

s and blood red fire shrimps are better choices since the commonly available

banded coral shrimp ''Stenopus hispidus'' is a shrimp-like decapod crustacean belonging to the infraorder Stenopodidea. Common names include coral banded shrimp and banded cleaner shrimp. Distribution ''Stenopus hispidus'' has a pan-tropical distribution, exten ...

can kill fish, and the

mantis shrimp Mantis shrimp, or stomatopods, are carnivorous marine crustaceans of the order Stomatopoda (). Stomatopods branched off from other members of the class Malacostraca around 340 million years ago. Mantis shrimp typically grow to around in length ...

will kill and eat most animals in a tank. ;

Snail A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class G ...

s: Some snails are parasitic but are rarely, if ever, offered in the saltwater aquaria trade. ;

Sponge Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate throug ...

s ;

Tunicate A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata (). It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates). The subphylum was at one time ...

s (sea squirts)

Reef unsafe

Fish

; Non-dwarf

Angelfish Angelfish may refer to: *Several groups of fish: **Freshwater angelfish, tropical cichlids of the genus ''Pterophyllum'' **Marine angelfish of the family Pomacanthidae **Atlantic pomfret (''Brama brama''), sold by fishmongers as "angelfish" in Sou ...

: This includes any of the larger angelfish. ; Non-planktivorous Butterflyfish: Eat mainly or exclusively coral polyps ; Non-planktivorous Triggerfish: This includes most triggerfish. Most triggerfish are highly aggressive carnivores that will eat many smaller fish and invertebrates in an aquarium. They also grow to be quite large.

Invertebrates

;

Sea apple Sea apple is the common name for the colorful and somewhat round sea cucumbers of the genus ''Pseudocolochirus'', found in Indo-Pacific waters. Sea apples are filter feeders with tentacles, ovate bodies, and tube-like feet. As with many other ho ...

s: Currently short-lived in aquaria. They release a highly-toxic substance at death, decimating the aquarium.

References

* {{Aquarium Fishkeeping