Not all fish are created equal,but these 6 are best choices,if you're looking for a commonly available and cool saltwater fish:
1. Banggai Cardinalfish
The cardinal fish is just one of several kinds of fish that are difficult to spot in the water.The Banggai Cardinalfish (Pterapogon kauderni) is a small tropical cardinalfish. These fish attract popular in the aquarium trade. This is one of the relatively few fish have been bred in captivity regularly, but a significant number are still caught in the wild and is now an endangered species, the species is restricted to the islands Banggai Indonesia. This species has a very limited geographic range (5,500 km ²) and the small size of the total population (estimated 2.4 million).
Banggai cardinalfish consists of isolated populations are concentrated around the shallows of 17 small islands and large 10 in Banggai Islands. A small population also occurs from Central Sulawesi, in Luwuk port. One additional populations have become established in the Lembeh Strait (North Sulawesi), 400 km north of the natural area of distribution of the species, followed by the introduction of aquarium fish traders in 2000.
This species grows up to 8 cm (3 inches) in total length. It has a distinctive contrasting pattern of black and light bars with white spots. This species is easily distinguished from all other cardinalfish tasseled first dorsal fin, anal fin ray elongated and two backs, forked tail fin, and a color pattern consisting of three black bars on the head and body and a prominent black anterior edge of the anal and dorsal fins second. Males can be distinguished from females with enlarged oral cavity flashy, obvious only when they reflect.
The Banggai’s natural diet consists of small benthic and planktonic crustaceans, and it will accept a wide variety of small, meaty foods in captivity, such as mysid shrimp, enriched brine shrimp, plankton, bloodworms, and chopped crustacean and mollusk flesh.
2. Common clownfish
The Clownfish originates in the shallow coastal waters of the Indo-Pacific region, including the Western Pacific Ocean, the Red Sea, the Indian Ocean and Australia's Great Barrier Reef. Clowns are hardy fish, making them excellent for beginners or a good choice for the more experienced as an addition to a reef tank. Tank bred pairs should be obtained and introduced into an established tank of at least 55 gallons. Clownfish are also known as the Clown Fish, the Orange Clown Fish, the Clown Anemonefish, the True Percula Clownfish and the Blackfinned Clownfish. The Clownfish was made famous in the aquarium trade as the popular hero of the Disney film Finding Nemo. They are often confused with the Amphiprion percula (known as the Clown Anemone Fish, the False Percula, the Black Clownfish, the Anemone Demoiselle or the False-Clown Anemonefish). Clowns are colored a bright orange with three white vertical stripes. The fins are rounded and have black margins. The colors darken to a solid orange with age. Clowns have 10 dorsal spines while the False-Clown has 11. Clowns have a higher dorsal fin at the front and the black margin around the 3 white bars also distinguishes it from the False-Clown. In nature, Clowns and False-Clowns are not found together.. Clowns like to hide among the tentacles of sea anemones. The anemone's tentacles kill other fish that touch them, but the Clown fish is immune to its sting. This makes the aneomone a great place for a Clown to hide out. Depending on the area of origin, Clowns will prefer specific types of anemone, such as: Heteractis crispa, Heteractis magnifica, and Stichodactyla gigantea. Although Clowns enjoy the shelter of a sea anemone, they will do well in a fish only tank. The fish only tank is recommended for beginners, as anemones are very difficult to keep. Clowns are very territorial with their own kind as they grow older, but they are not aggressive to other species. If introduced to the aquarium at the same time, many varieties of tank raised clowns can be maintained together in the aquarium, however they will tend to become territorial with age with the dominant male and female becoming much larger than the others in size. More than 2 Clowns are therefore not recommended for beginners.
3. Coral Beauty
Also called the Two-spined angel, this species can be found throughout the West Pacific and Indian Ocean and can reach a maximum size of about 4”. They’re typically as hardy and easy to care for as they come, and I haven’t had any troubles keeping them in reef aquariums, either. Still, I have heard of instances of them nipping at tridacnids and some corals. Note that they can also range from being almost entirely deep blue in color to having a mostly orange body, depending on the individual.
One of the more hardy varieties of Angel Fish, Coral Beauty Angels could make an attractive fish for a saltwater aquarist wishing to begin keeping Angel Fish. These lovely fish can add to the beauty of any saltwater tank, with their intense shades of beautiful coloring. The Coral Beauty Angel can be kept with most other fish. They should be kept in a tank large enough for each fish to have a territory that does not overlap with those of other dwarf angels. If the enclosure is too small, these fish may act aggressively toward each other, and they normally do not tolerate other Dwarf Angels. Coral Beauty Angels seem to be one of the more hardy varieties of Angel Fish. They may nip at invertebrates in a reef environment, so they should be carefully watched. Many Coral Beauty Angels spend little time in hiding, making them visible in your aquarium to amuse you with their beauty and activity.
The Coral Beauty Angel is most commonly found in the Indo Pacific but ranges from East Africa to the Philippine Islands. Many Coral Beauty Angels seen in the pet trade are collected from Fiji.
4.Green chromis
The Green Chromis, Chromis viridis, is a species of damselfish indigenous to the Indo-Pacific region. This species from the family Pomacentridae is found in large aggregations above Acropora corals in sheltered areas such as lagoons and reef flats. The Green Chromis has slender, elongated, oval bodies with an iridescent green sheen and forked tail. As it swims under the aquarium lighting, the Green Chromis shows a mesmerizing shimmer that will provide a flash of brilliance in your aquarium. The Green Chromis is mellow as the most peaceful damsel and are safe for any home aquarium. They look splendid in schools, and exquisite in a well lit aquarium. The Green Chromis fish are active swimmers and spend most of their time in the upper to mid-levels of an aquarium during the day. They are very easy to maintain and does not require much care or time. A good assortment of live rock will make them feel right at home. The Green Chromis is a great addition in your tank because of its peaceful nature and for its unique color. If you have created a perfect biotope for this fish, you may be lucky enough to see them spawn. The male will prepare a nest in the sand, in which several females of the species will share. Once fertilized, the male will guard the nest until the eggs hatch and encourage water flow by fanning the nest. Eggs that are not fertilized or showing no signs of hatching will be eaten by the male. The Green Chromis is a great addition in your tank because of its peaceful nature and for its unique color, thus making a very valuable addition to your home tank.
5.Royal Gramma
The Royal Gramma is one of the most popular of the Basslet species combining beautiful coloration with a very hardy nature that is at home in either a community or reef aquarium. The adult size of the Royal Gramma, at only 3 inches also makes this species very popular with nano reef and small aquarium owners. While a very peaceful species, the Royal Gramma is aggressive towards its own species, displaying a very territorial nature towards others of its own species.
The Royal Gramma requires live rock or other aquascaping to provide it with a safe place to hide when threatened and to give caves in crevices in which to explore and graze on algae. Being a deep water species, the Royal Gramma will also be more comfortable in the aquarium environment with rock caves and crevices to escape the often intense marine aquarium lighting.
One of the most highly sought after of the basslets, the Royal Gramma Basslet or Fairy Basslet is a beautiful combination of electric purple and yellow. The front half of its body and head are a bright purple to violet, while the back half is a striking and vibrant yellow. There is a black mark extending over both eyes; as well as, a black dot located on front section of the dorsal fin. The fading between the it's two main colors provides a striking gradient pattern that further makes this species so attractive.
The Royal Gramma Basslet is a very hardy carnivore that will adapt quickly to feeding on meaty foods within the aquarium environment. Any meaty foods such as quality marine flack, mysid shrimp, quality frozen foods, marine fish & crustacean flesh etc. will be readily consumed. As with most species, a varied diet of marine foodstuffs will provide the Royal Gramma with a balanced diet.
6.Pajama Cardinalfish
The Pajama Cardinalfish is a very oddly colored fish. It is perhaps the spots that give it the appearance that it might be hanging about in it’s ‘jammies’. Like the other Cardinalfish, it is a very hardy fish. It’s hardiness makes this an easy fish for the beginning aquarist to maintain. Cardinals are nocturnal by nature and will spend most of their time in the shadier areas of the aquarium and will come out after dark. They will learn to adjust to the brighter lit aquarium in time. Unlike many other Cardinals, this particular fish prefers to be in groups and schools. It will live peacefully with other non-aggressive fish.
Feed frozen small meaty foods or finely chopped prepared foods. Cardinalfish eat small fishes and mobile crustaceans in the wild. If your Cardinalfish appears to not eat, try feeding after the aquarium lights turn off. Many Cardinalfish have nocturnal tendencies and will prefer to be fed after the lights go out in the aquarium.
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