Pacific Creole Anthias (Paranthias Colonus) saltwater aquarium fish

Overview:

The Pacific Creole Anthias (Odontanthias borbonius, often referred to in trade as a deepwater anthias) is a beautiful, active marine fish that does best in a stable, mature reef aquarium. Despite their hardiness once acclimated, they are sensitive to sudden changes in water quality, salinity, and temperature. Provide a calm environment with plenty of open swimming space, moderate flow, and multiple hiding areas such as caves and overhangs. A securely covered tank is important, as anthias are known jumpers. Ideal conditions include pristine water, low nitrate, strong oxygenation, and consistent reef parameters. They are best kept in larger aquariums, especially if housed in groups, because space reduces aggression and allows natural schooling behavior. Keep them in a peaceful system with minimal harassment, since stress can quickly lead to poor feeding and declining condition.

Diet and Feeding:

Pacific Creole Anthias are planktivores and should be fed small, frequent meals throughout the day. In the wild, they rely on drifting zooplankton, so a care diet should closely match that pattern. Offer a varied mix of high-quality frozen foods such as mysis shrimp, enriched brine shrimp, copepods, krill mince, and finely chopped marine seafood. They also benefit from quality pellet foods designed for carnivorous marine fish, especially if the fish is trained to accept prepared foods. Feed two to four times daily when possible, using small portions that are eaten quickly. Overfeeding should be avoided, but underfeeding is a common problem with anthias and can lead to weight loss. Soaking foods in vitamin supplements and omega-rich additives can support immune function and coloration. Because they are active swimmers with high metabolism, consistent feeding is one of the most important parts of long-term success.

Compatibility:

Pacific Creole Anthias are generally peaceful and should be kept with non-aggressive tankmates. Good companions include other calm reef fish such as fairy wrasses, peaceful tangs, gobies, cardinals, blennies, and similarly tempered anthias species. Avoid housing them with territorial or highly aggressive fish, as stress may prevent feeding and cause chronic hiding. Large predatory species should also be avoided. If keeping a group, introduce them together when possible, and provide enough space to reduce social pressure. Males may show mild display behavior, but serious aggression is uncommon in a suitably large aquarium. In mixed anthias groups, ensure there are ample feeding stations so all fish can eat without competition.

Health and Quarantine:

Quarantine is strongly recommended before adding Pacific Creole Anthias to the display tank. A 2–4 week observation period helps detect parasites, bacterial infections, and feeding issues early. This species is prone to stress-related illnesses if acclimation is rushed, so use a gentle drip acclimation and keep lighting subdued at first. Watch closely for signs of weight loss, rapid breathing, clamped fins, faded color, or refusal to eat. Because anthias are sensitive to copper and medications, any treatment should be used cautiously and only when necessary, ideally in quarantine. Maintaining excellent water quality, stable salinity, and frequent feeding is the best preventive care.

mysis shrimp brine shrimp finely chopped meaty foods
Pacific Creole Anthias are active midwater swimmers that spend much of the day cruising in the water column and require a spacious aquarium with open swimming lanes, overhangs, and plenty of rockwork for retreat. They are generally peaceful and reef-safe, but conspecifics can establish a loose dominance hierarchy, so groups should be introduced carefully to reduce chasing and stress. A minimum tank size of 75 gallons is recommended for a small group, with visual barriers created by branching rockwork helping to break line of sight and limit aggression. They coexist best with other calm reef-safe species and are usually outcompeted or intimidated by very boisterous tank mates. As planktivorous carnivores, they feed primarily on zooplankton in nature and should be offered frequent small meals of mysis, enriched brine shrimp, copepods, and quality frozen or pellet foods.

FAQ

Frequently Asked Questions

About the Pacific Creole Anthias

  • How much swimming room does a Pacific Creole Anthias actually need, and can it be kept in a smaller “reef” tank because it stays relatively small?
    Even though individual Pacific Creole Anthias are not large fish, they need more space than their size suggests. They do best in a mature, very stable reef with plenty of rockwork, caves, and open water for brief bursts of swimming. A larger tank is strongly preferred because they are shy, stress easily, and do poorly if housed in cramped quarters with aggressive or overly active tankmates.
  • What is the best feeding strategy for getting a Pacific Creole Anthias to thrive long-term in captivity?
    Frequent small feedings are the key. They typically do best on a mix of finely chopped seafood, enriched frozen mysis, copepods, and other small meaty foods. Many individuals need multiple small meals per day at first because they are naturally planktivores and can waste away if fed only once daily or on large pellets. Varied, high-quality foods are essential.
  • Will a Pacific Creole Anthias eat prepared foods right away, or is it usually a difficult acclimation fish?
    They are commonly shy and can be reluctant eaters at first, especially wild-caught specimens. Some adapt quickly to frozen foods, but others need live or very small moving foods to start. The best success comes from a calm environment, dim lighting initially, low competition at feeding time, and offering small foods several times a day until the fish gains confidence.
  • Can Pacific Creole Anthias be kept with other anthias, and do they need to be in a harem like many other anthias species?
    They can usually be kept with peaceful tankmates, but compatibility depends heavily on the individual and the tank size. Unlike some more common anthias species, they are often less tolerant of high social pressure and may become stressed if forced into a crowded group. A single specimen or a carefully managed small group in a larger aquarium is often safer than assuming a harem setup will work.
  • Is the Pacific Creole Anthias reef-safe, and are there any corals or invertebrates it commonly bothers?
    Yes, it is generally considered reef-safe. It does not typically pick at corals, clams, or most ornamental invertebrates. The bigger concern is not compatibility with corals, but rather stress, food competition, and tankmate aggression. In a well-fed, peaceful reef, it can be an excellent display fish.