Red Stripe Anthias (Pseudanthias Fasciatus) saltwater aquarium fish

Overview:

Red Stripe Anthias are active, open-water reef fish that do best in a mature, stable marine aquarium with plenty of swimming room and rockwork for shelter. They thrive in well-oxygenated systems with moderate to strong water movement and excellent filtration. A peaceful reef setup is ideal, as this species can be shy at first and is easily stressed by aggressive tankmates or unstable water conditions. Keep them in a tank with stable salinity, low nitrate, and very clean water. They prefer subdued-to-moderate lighting and an aquascape that offers caves, ledges, and open space. Because they are plankton feeders by nature, they should be housed in a system that can handle frequent feeding without rapid water quality decline.

Diet and Feeding:

Red Stripe Anthias need frequent, small meals rather than one or two large feedings. In the wild, they consume tiny drifting zooplankton throughout the day, so a care-focused feeding plan should reflect that behavior. Offer a varied diet of enriched frozen mysis, copepods, krill eggs, finely chopped seafood, quality marine pellets, and specialized anthias or reef plankton foods. Feed juveniles and newly introduced fish 3 to 5 times daily if possible; adults usually do well with 2 to 4 small feedings. Use foods with added marine oils and vitamins to support color, immune function, and energy. Because anthias are high-metabolism fish, they can lose weight quickly if underfed, so watch body condition closely. Automatic feeders can help maintain consistency, especially for pellet-trained individuals.

Compatibility:

Red Stripe Anthias are generally peaceful and work best with other calm reef fish. Good tankmates include gobies, wrasses, blennies, tangs, dartfish, and other non-aggressive anthias species, provided the system is large enough and there is no intense feeding competition. Avoid boisterous or territorial fish such as large damsels, triggerfish, dottybacks, hawkfish, or aggressive wrasses, as these can intimidate them and prevent adequate feeding. They are best kept in harems or small groups, with one male and multiple females if the tank size supports it; this helps reduce stress and encourages natural behavior. In smaller tanks, a single specimen may be safer than a poorly managed group. They are reef-safe and do not typically bother corals, snails, or shrimp.

Health and Quarantine:

Common concerns include starvation, stress-related hiding, parasite issues, and bacterial infections caused by poor water quality. Quarantine is strongly recommended for 3 to 4 weeks in a separate tank with stable conditions and frequent feeding. Observe for rapid breathing, flashing, white spots, frayed fins, or refusal to eat. Because anthias can be sensitive, any medication should be used cautiously and only when necessary. During quarantine, offer nutrient-rich foods several times daily and monitor weight and activity closely. Preventive care depends on pristine water, regular small feedings, low aggression, and gradual acclimation to reduce shock.

mysis shrimp brine shrimp finely chopped meaty foods
Red Stripe Anthias are active, midwater schooling swimmers that do best in spacious tanks with plenty of open swimming room alongside sheltered retreat areas. They are generally peaceful and timid, though males may show mild territoriality toward conspecifics, especially in smaller systems or when space is limited; keeping them in groups helps reduce stress. A minimum tank size of 70 gallons is recommended, with a layout that includes ample rockwork and visual barriers to break lines of sight and provide security without crowding their swimming lanes. They are usually compatible with other reef-safe species and non-aggressive tank mates, but should be protected from boisterous or highly dominant fish that may outcompete them for food. Red Stripe Anthias are carnivorous to planktivorous feeders, relying on frequent small meals of zooplankton, copepods, and finely prepared meaty foods in captivity. Because of their constant activity and high metabolism, they thrive best in mature, stable reef systems with strong filtration and a regular feeding schedule.

FAQ

Frequently Asked Questions

About the Red Stripe Anthias

  • How many Red Stripe Anthias should I keep together, and what social structure works best in a home aquarium?
    Red Stripe Anthias are best kept in a harem setup: one male with several females. A group of 1 male to 3–6 females is ideal if the tank is large enough. They are social, active planktivores, and a lone specimen often becomes shy or stressed. If you keep multiple males in a confined space, aggression can become a problem, especially once one starts transitioning.
  • What tank size and aquascape do Red Stripe Anthias need to feel secure and feed properly?
    They do best in a tank of at least 125 gallons, with more room preferred for a proper group. The aquascape should include plenty of rockwork with overhangs, ledges, and swim space. They like to dart in and out of cover but spend much of their time in the water column. Strong flow and high oxygenation help them thrive, especially because they are constant swimmers and active feeders.
  • How often do Red Stripe Anthias need to be fed, and what foods are best?
    They need frequent feedings, usually 3–5 small meals per day. In the wild they feed on zooplankton throughout the day, so one big feeding is not enough. Best foods include enriched frozen mysis, copepods, rotifers, finely chopped seafood, and high-quality small pellet foods designed for carnivores. A varied diet is important, and regular feeding is essential to prevent weight loss.
  • Are Red Stripe Anthias reef-safe, and will they bother corals or invertebrates?
    Yes, they are generally reef-safe. They do not normally nip corals, clams, or ornamental invertebrates. Their main concern in reef tanks is not aggression toward livestock, but their demanding feeding schedule and sensitivity to water quality. Because they eat so often, a reef system must have strong filtration and nutrient control to avoid excess waste buildup.
  • Why do Red Stripe Anthias sometimes lose color or stop eating after introduction, and how can I help them settle in?
    Stress during shipping and acclimation is very common with this species. Color fading and feeding reluctance often happen when they are placed in a tank with aggressive tankmates, weak flow, poor acclimation, or insufficient shelter. To help them settle, introduce them to a peaceful tank, offer multiple small feedings of tempting live or frozen foods, and keep the lights slightly subdued at first. Quarantine is strongly recommended, but only if you can maintain excellent water quality and frequent feeding there too.