Species Category: Miscellaneous Fish

Sea robins are distinctive, bottom-dwelling marine fish known for their broad, armored heads, wing-like pectoral fins, and unusual “walking” behavior. These fins are often brightly colored and can be spread wide, giving the sea robin an eye-catching appearance as it moves along sandy or muddy substrates. Native to coastal waters of the Atlantic, sea robins are hardy, curious fish that spend most of their time exploring the seafloor in search of food, using modified fin rays to feel and probe the sand.

The Oriental Sweetlips, *Plectorhinchus vittatus*, is a striking and large species of grunt that is best suited for very large, experienced aquarists. Its body is primarily white with bold, horizontal black stripes that run from head to tail. As the fish matures, these stripes may become less distinct and the body color can darken.

A minimum of a 250 gallon tank is required to house a single adult Oriental Sweetlips due to its potential size and active nature. The tank should have plenty of open swimming space as well as some rockwork for hiding. This species is not considered reef safe as it may nip at corals and other invertebrates.

The Oriental Sweetlips is a carnivorous species and requires a diet of meaty foods such as chopped seafood, mysis shrimp, and other frozen or live foods. They are typically nocturnal feeders in the wild, so feeding after the lights are out may be beneficial.

There are no readily distinguishable differences between males and females, and breeding in a home aquarium is not common. This species can be sensitive to water quality, so excellent filtration and regular water changes are essential for their long-term health. Due to their size and specific care requirements, Oriental Sweetlips are recommended for advanced hobbyists with appropriately sized aquariums.

The Red Emperor Snapper, *Lutjanus sebae*, is a striking and robust fish known for its vibrant red coloration and distinctive markings. Juveniles display prominent white bands across their body, which fade as they mature, leaving a predominantly red fish with subtle darker markings.

A minimum tank size of 250 gallons is recommended to accommodate the potential adult size of this species. Provide ample open swimming space along with rocky overhangs and caves for shelter. While generally peaceful with tankmates too large to be considered prey, they can be territorial, especially as they grow. They are not suitable for reef aquariums as they will consume smaller fish and invertebrates.

The Red Emperor Snapper is a carnivorous species and should be offered a varied diet of high-quality marine pellets, frozen foods such as mysis shrimp, krill, and chopped fish or squid. They are active hunters and will readily accept food offered in the water column. In a home aquarium, they can reach a size of up to 24 inches, though they may grow larger in the wild. There are no readily apparent visual differences between males and females. Breeding in a home aquarium is not common.

Flounder *Paralichthys* spp.

Flounder, belonging to the genus *Paralichthys*, are fascinating and unique flatfish that can be a captivating addition to a large, species-specific aquarium. Their remarkable camouflage abilities and intriguing hunting behavior make them a point of interest for experienced aquarists.

A minimum of a 180 gallon tank with a deep sand bed is recommended to provide ample space for the Flounder to bury itself and move around. The tank should be designed to mimic a sandy or muddy bottom environment. Due to their predatory nature, Flounder are not suitable for reef tanks or community tanks with smaller fish or invertebrates. They will readily consume any tankmates they can fit in their mouth.

Flounder are ambush predators and require a diet of meaty foods. They should be fed a variety of fresh or frozen seafood such as silversides, shrimp, squid, and small feeder fish (use sparingly and ensure they are disease-free). They may also accept sinking pellets designed for carnivorous fish.

In a home aquarium, Flounder can grow quite large, potentially reaching lengths of 12 inches or more depending on the specific species and tank conditions. They are not typically bred in captivity. There are no readily distinguishable external differences between males and females.

The Longhorn Cowfish, *Lactoria cornuta*, is a truly unique and captivating addition to the marine aquarium. Easily recognized by the prominent, horn-like spines extending forward from its head and backward from its anal region, this fish possesses a boxy, armored body. Its coloration is typically a vibrant yellow to greenish-yellow, often adorned with iridescent blue spots.

A minimum tank size of 125 gallons is recommended for the Longhorn Cowfish due to its potential adult size and need for ample swimming space. Provide plenty of open areas for swimming, along with some rockwork for potential hiding spots, although they are generally not shy. This species is not considered reef-safe as it may nip at corals and invertebrates.

The Longhorn Cowfish is a slow and deliberate swimmer. It is important to note that when stressed or threatened, this fish can release a toxin (ostracitoxin) from its skin, which can be harmful or even fatal to other fish in the aquarium. Therefore, it is best kept in a species-only tank or with very peaceful, non-aggressive tank mates.

In the aquarium, the Longhorn Cowfish will accept a varied diet. Offer a mix of meaty foods such as mysis shrimp, brine shrimp, and chopped seafood. They will also graze on algae and should be offered high-quality marine flake and pellet foods. They can grow up to 18 inches in the wild, but typically reach a more manageable size of around 10-12 inches in a home aquarium. Sexing is difficult, and breeding in captivity is not common.

The Bicolor Parrotfish, *Cetoscarus bicolor*, is a stunning and active addition to a large, mature marine aquarium. As its name suggests, this species exhibits a dramatic color change throughout its life. Juveniles are primarily white with a prominent black stripe running horizontally along the body and a yellow tail. As they mature, they transition into the vibrant adult coloration, with males displaying a striking blue-green body and pinkish-orange fins, while females are typically more reddish-brown with a lighter underside.

A minimum tank size of 180 gallons is recommended to accommodate the active swimming habits and potential adult size of the Bicolor Parrotfish. A mature aquarium with ample live rock is essential, as they are primarily herbivores and will graze on algae. They are known to consume large amounts of algae, making them excellent algae controllers in a suitable environment. However, their powerful beaks can damage live rock and potentially nip at corals and other invertebrates, so they are best suited for a fish-only or FOWLR (Fish Only With Live Rock) aquarium.

In the wild, Bicolor Parrotfish primarily feed on algae and the coral polyps they scrape from the reef. In the aquarium, their diet should consist of a variety of marine algae, high-quality herbivore pellets and flakes, and occasional offerings of mysis shrimp or other meaty foods. Providing a diverse diet is crucial for their long-term health and vibrant coloration.

Bicolor Parrotfish are protogynous hermaphrodites, meaning they are born female and can change to male later in life. Breeding in captivity is extremely difficult and rarely achieved. There are noticeable color differences between adult males and females.