Most Beautiful Saltwater Fish for Aquariums

Most people who keep reef or saltwater aquariums would probably agree that fish were what first drew them into the hobby. Although corals may eventually become just as fascinating, fish remain an important part of creating a more dynamic and visually interesting aquarium. With so many stunning marine species available, there is no reason not to bring some of those remarkable colors and patterns into your tank. Watching brilliantly colored fish move between rocks and corals can be one of the most rewarding parts of the hobby. Here are several of the most beautiful saltwater fish that can be kept in aquariums.

Mandarin Dragonet

The Mandarin Dragonet is one of the most highly desired fish among saltwater aquarium enthusiasts, and its extraordinary coloration makes it easy to understand why. Its orange body is decorated with intricate light-blue lines, dark blue edging, and touches of green that create an almost artistic appearance. Its unusual body shape adds even more character. Rather than having the streamlined appearance common to many fish, the Mandarin Dragonet has a broad, almost dragon-like form. Males also possess a prominent dorsal fin that they occasionally raise, making their appearance even more impressive.

Other than meeting its dietary requirements, the Mandarin Dragonet is relatively manageable to keep and does not need an enormous aquarium. This combination of striking appearance and modest size has made it especially popular with marine aquarium keepers.

Once you decide that a Mandarin Dragonet is right for your aquarium, understanding its feeding requirements becomes essential. These fish have traditionally been considered challenging to maintain, although keeping them has become somewhat easier in recent years. Some dragonets now readily accept frozen foods, and copepods have also become easier for hobbyists to obtain. Captive-bred specimens may already be accustomed to frozen foods or can often be trained to accept them. You can also introduce copepods into your aquarium to establish a reliable natural food source and help prevent the fish from going hungry. With the right preparation, maintaining a healthy Mandarin Dragonet becomes much more achievable.

Even when these improvements make care easier, several other factors still need attention, particularly aquarium maturity and tank size. A newly established aquarium may struggle to maintain a consistent copepod population because its water chemistry and beneficial bacterial communities are still developing. A mature aquarium, on the other hand, has had much more time to establish and maintain a larger population of copepods.

Tank volume is equally important. At first, it may seem strange that such a small fish would require a relatively large aquarium. The reason has little to do with the fish itself and much more to do with its food supply. A Mandarin Dragonet can quickly consume most of the copepods in a small aquarium, eventually leaving itself without enough food. A larger aquarium provides more rockwork and hiding places where copepods can continue reproducing even while the dragonet feeds. For this reason, an aquarium of around 50 gallons or more is generally considered ideal.

The Mandarin Dragonet is famous for its spectacular colors, but the Psychedelic Dragonet is another species that is sometimes overlooked. Its care requirements are similar, but its appearance is quite different. Its pale grayish-white body is covered with orange, black, and vivid blue markings, while its head features distinctive stripes. For aquarists looking for something less common but equally eye-catching, the Psychedelic Dragonet can be an appealing alternative.

Coral Beauty

The Coral Beauty is another exceptionally attractive marine fish, displaying shades that range from rich purple and brilliant blue to intense orange. Its combination of colors makes it stand out immediately in a saltwater aquarium.

This species belongs to the dwarf angelfish group. It has the familiar body shape associated with angelfish but remains considerably smaller than many of its relatives. It can also be kept in a reef aquarium with some caution. There is always a possibility that an individual may nip at certain corals, although this behavior varies from one fish to another. If you are uncertain about its compatibility with your corals, you can monitor the fish carefully after introduction and observe whether it shows an interest in nipping them.

Aside from this potential issue, Coral Beauties are generally straightforward to feed and care for. They readily accept many prepared aquarium foods as well as seaweed and nori. Keeping them with other angelfish requires particular caution, especially in smaller aquariums. Although there are occasional examples of Coral Beauties and Flame Angelfish successfully sharing a relatively small tank, aggressive interactions can occur and may ultimately result in serious injury or death.

Originally found among the reefs of regions such as Indonesia and Fiji, Coral Beauties are now also being bred in captivity. This gives aquarium keepers a better opportunity to obtain specimens that are accustomed to life in an aquarium. Captive-bred fish are generally less vulnerable to certain common marine diseases, including ich and marine velvet, and they can adjust more readily to aquarium conditions. As a result, they can be more comfortable and better suited to life in reef and saltwater aquarium environments.

Leopard Wrasse

The Leopard Wrasse combines spectacular coloration with an energetic personality. As its name suggests, its body is covered with an eye-catching leopard-like pattern. Several varieties of Leopard Wrasses are available, and their colors can differ significantly. Males are commonly orange with blue spots, while females are often white with black spots accented by orange and green. Other individuals may display vivid green coloration or combinations of dark backgrounds, blue spots, red markings, and white patterns. Although the different varieties can look quite distinct, their general care requirements are similar.

As members of the wrasse family, Leopard Wrasses share many of the same needs as other wrasses. A secure aquarium lid is extremely important because these fish are capable jumpers. Even surprisingly small openings can provide enough room for a fish to escape. A substantial sand bed is also necessary because wrasses commonly bury themselves in the sand when sleeping or when they become frightened. A sand bed of at least four inches is recommended.

As with the Mandarin Dragonet, feeding requirements are one of the main reasons Leopard Wrasses can be challenging to maintain. They have fast metabolisms and therefore need to be fed multiple times throughout the day, usually two or three feedings. They can also be particularly selective about food. Aquarium maturity is another important consideration because established systems tend to support larger and more stable populations of copepods and other tiny crustaceans that can supplement their diet. Because of these demanding requirements, Leopard Wrasses are generally better suited to experienced marine aquarium keepers.

The vivid patterns and brilliant colors of a Leopard Wrasse are almost guaranteed to attract attention whenever someone looks into your aquarium. However, maintaining such a spectacular fish requires considerably more experience and preparation than keeping many easier marine species.

Blue Dot Jawfish

The Blue Dot Jawfish, also called the Bluespotted Jawfish, is native to Mexico. Its elongated body is covered with shimmering blue spots set against an orange-yellow background, giving it an especially distinctive appearance. Jawfish are well known for excavating burrows in the aquarium substrate. The Blue Dot Jawfish is unusual because it creates its burrow vertically rather than following the typical burrowing pattern of some other jawfish species. Because of this behavior, it requires a relatively deep sand bed, with around five inches being the minimum depth.

The good news is that feeding this fish is generally uncomplicated. It can accept a variety of foods, including pellets and frozen preparations. As long as the fish feels secure enough to emerge from its burrow and feed, its dietary needs are relatively easy to meet. However, if it feels threatened because it cannot construct a suitable burrow or because an aggressive predator is present, it may stop eating altogether. Providing a sufficiently deep substrate and peaceful tank companions can greatly reduce this problem.

Like wrasses and many other marine fish, Blue Dot Jawfish are capable of jumping from an uncovered aquarium. A securely fitted lid is therefore essential. Without one, even a healthy and settled jawfish can suddenly escape from the tank.

The main drawback of the Blue Dot Jawfish is its cost. Individual specimens can sell for as much as $170. Although that is considerably more expensive than many other aquarium fish, its unusual appearance and relative rarity can make the price more understandable to enthusiasts searching for something distinctive.

Some of these species have specialized requirements that may be beyond the experience level of newer aquarium keepers. That does not mean you cannot eventually add one to your collection. As your knowledge and skills improve, you may become capable of successfully maintaining one of these more demanding fish. For experienced aquarists, introducing a striking saltwater species such as a Leopard Wrasse or Blue Dot Jawfish can be an especially rewarding part of the hobby.