Purple Stripe Dottyback - Pseudochromis diadema

$22.99

Purple Stripe Dottyback - Pseudochromis diadema

Name: Purple Stripe Dottyback - Pseudochromis diadema
Brand: TSA Fish
SKU: DOTTYxDiadema
Price: 22.99 USD
Availability: OutOfStock

Dottyback Nano Fish Reef Safe

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Min Tank Size 30 gallons

Temperament Semi-Aggressive

Reef Safe Yes

Care & Diet Feeding, nutrition, and best practices.

Diet Type: Carnivore

Diadem Dottybacks are carnivorous and require a protein-rich diet. Feed them a varied menu of high-quality frozen or live foods such as brine shrimp, mysis shrimp, and finely chopped seafood. Supplement their diet with marine pellets or flakes formulated for carnivorous fish. Feed small amounts 1-2 times daily, ensuring they consume all food within a few minutes to prevent waste buildup. Occasional vitamin-enriched foods can support their vibrant coloration and overall health.

Pellets Mysis Finely Chopped Seafood

Behavior Temperament, activity level, and interactions.

Temperament: Semi-Aggressive

The Diadem Dottyback is a territorial and aggressive species, often seen swimming in short bursts to patrol its claimed area. It tends to establish a home base within rock crevices or coral structures. Socially, it is solitary and may exhibit hostility towards similar-looking fish or smaller tank mates. Compatibility is limited, as it can cohabit with larger, non-aggressive species but may bully smaller or passive fish. It is best kept with fish that are not easily intimidated and have established territories of their own.

Tank & Aquascape Tank requirements and aquascaping tips.

Min Tank Size: 30 gallons
Max Size: 3 inches
Care Level: Easy
Origin: Indonesia

Compatibility Tank mates, aggression, and introduction order.

Temperament: Semi-Aggressive
Reef Safe: Yes

Dottyback Reef Carnivore

Reef & Health Reef safety, common issues, and prevention.

Reef Safe: Yes
Care Level: Easy

FAQs Answers to the most common questions.

My Diadem Dottyback keeps darting out and nipping at my flasher wrasse and goby when they get close to its cave. Is this normal, and how can I manage its aggression without removing it from the tank?

Diadem Dottybacks (Pictichromis diadema) are naturally territorial cave dwellers and will aggressively defend a “zone” of rockwork, especially in smaller tanks under ~40 gallons. This behavior is normal, but you can manage it. First, rearrange rockwork to break line of sight and create multiple caves, spreading territories out. Provide at least one tight crevice or cave for the dottyback at the lower rear of the aquascape, plus alternate hideouts for other fish. Feeding smaller, more frequent meals (2–3x daily) can reduce food-guarding behavior. If the tank is borderline small, increasing space (ideally 30–40 gallons minimum for a mixed community) helps. Adding new, more delicate fish last, with the lights dimmed, reduces initial hostility. If a specific tankmate is being relentlessly chased to the point of frayed fins, hiding, or weight loss, use an acclimation box to let the dottyback see but not reach that fish for several days, then release once chase intensity drops. In some very small systems or with very passive tankmates, permanent separation may be necessary, but many keepers achieve peace through aquascape changes and careful stocking order.

The colors on my Diadem Dottyback look washed out and pale compared to photos online. What specific conditions bring out their best purple and yellow coloration?

Diadem Dottybacks show their strongest purple head and yellow body when several factors are in place: stable water quality (nitrate generally below ~20 ppm, no ammonia or nitrite) and low chronic stress. Provide plenty of rock caves so it feels secure; stressed dottybacks often mute their colors and hide. Good quality lighting with a strong blue spectrum (typical reef LEDs with actinic channels) helps their purple and yellow tones appear richer. Diet matters a lot: offer a varied menu of high-quality marine foods with carotenoids and astaxanthin—such as mysis shrimp, krill-based pellets, and enriched frozen blends—several times per week. Avoid feeding only flake or only brine shrimp, which are less nutritious. Keeping them as the dominant small fish, not bullied by larger aggressive species, also encourages confident display and brighter colors. Over a few weeks of improved diet, lighting, and reduced stress, you should see more saturated coloration.

My Diadem Dottyback keeps stealing food from LPS corals and ignoring some of the pellets I feed. What is an ideal feeding routine and food mix for this species in a mixed reef?

Diadem Dottybacks are opportunistic carnivores that quickly learn to snatch meaty coral foods. To reduce coral food theft, feed the dottyback first with a targeted fish feeding, then feed corals after the fish have lost some interest. Ideal foods include small mysis shrimp, chopped marine shrimp, finely chopped clam or mussel, and quality marine pellets in the 0.5–1 mm range. Aim for 1–2 small feedings per day, more frequent but smaller portions if your tank is lightly stocked and nutrient-limited. Rotate between frozen mysis, a quality reef carnivore pellet, and occasional enriched brine shrimp or copepod-based foods to cover micronutrients. If it ignores pellets, soak pellets in thawed mysis juice for a week or two to associate the smell with food. Over time, many Diadem Dottybacks accept pellets eagerly, which helps ensure a consistent and complete diet without overfeeding the system.

I’m planning a nano reef and want a pair of Diadem Dottybacks. Can they be kept as a mated pair or in a group, and how would that work in a home aquarium?

Diadem Dottybacks are best kept singly in most home tanks; they are highly territorial toward their own kind. In small or medium aquariums, two unrelated individuals commonly fight, sometimes to the death. In nature they may form loose pairs or harems in larger territories, but replicating that spacing is difficult. A true bonded pair can sometimes be kept in a larger tank (50+ gallons) with extensive rockwork and multiple caves, but these are rarely sold as confirmed pairs. Mixing several juveniles in a very large, rock-heavy system may result in a loose hierarchy, yet this is risky and not recommended for typical home setups. For a nano or small reef, stick to one Diadem Dottyback. If your goal is breeding, work with a dedicated breeder who can supply a known pair and be prepared for a species-focused tank with few, if any, other small, cave-dwelling fishes.

My new Diadem Dottyback spends almost all its time wedged in a rock crevice and only dashes out at feeding time. How do I know if this is just normal behavior or if something is wrong with the fish or water conditions?

It is normal for a newly introduced Diadem Dottyback to be very reclusive for the first few days to a couple of weeks, especially if tankmates are active or boisterous. Healthy “shy but normal” behavior includes quick dashes for food, bright eyes, intact fins, normal respiration (not rapidly pumping gills), and gradual increase in visible swimming as it settles. Concerning signs include heavy breathing, clamped fins, failure to eat after 2–3 days, obvious spots or lesions, frayed fins, or hanging at the surface or in a corner. To evaluate water conditions, test for ammonia and nitrite (both should be 0), nitrate (ideally under ~20–30 ppm), temperature (around 24–26°C / 75–79°F), and salinity (about 1.024–1.026). If all parameters are within range and it is eating and occasionally exploring, patience is usually all that’s needed. Providing a dimmer photoperiod at first, plus more caves, often speeds up adjustment. If hiding persists for more than a couple of weeks or it stops eating, investigate disease, bullying from tankmates, or unstable parameters more closely.

The Purple Stripe Dottyback (Pictichromis diadema), frequently sold under its original scientific name Pseudochromis diadema, is a brilliantly colored saltwater fish with a vivid yellow body topped by an intense magenta-to-purple stripe extending from the head along the upper back. Its compact size and electric coloration make it an eye-catching addition to reef and fish-only aquariums. Pictichromis diadema is the currently accepted scientific name, while Pseudochromis diadema remains a widely recognized synonym in the aquarium trade.

Native to the Western Central Pacific, this species occurs around Peninsular Malaysia, the Philippines, and northern Borneo. In nature, it inhabits sheltered reefs with abundant coral growth, typically staying close to rocks, crevices, and other protective structure. Adults reach approximately 2.4 inches in total length.

Despite its small size, the Purple Stripe Dottyback has a confident and territorial temperament. It can be an excellent choice for aquarists looking for a hardy, colorful marine aquarium fish, but tankmates should be selected carefully because established individuals may aggressively defend their preferred cave or section of rockwork.

Quick Care Guide

Care Level: Easy to Moderate
Minimum Tank Size: 30 gallons
Temperament: Semi-aggressive
Diet: Carnivore
Reef Safe: With Caution
Region: Western Central Pacific — Peninsular Malaysia, Philippines, and northern Borneo
Scientific Name: Pictichromis diadema — synonym: Pseudochromis diadema

The species reaches approximately 6.2 cm, or 2.4 inches, and its territorial behavior makes adequate rockwork and personal space important even though it remains relatively small.

Tank Requirements

Provide a well-established saltwater aquarium with plenty of live rock, caves, overhangs, and narrow crevices. Purple Stripe Dottybacks naturally remain close to reef structure and will typically establish a particular cave or section of rockwork as their territory.

Arrange the aquascape to create multiple hiding areas and broken lines of sight, especially in community aquariums. This gives both the dottyback and its tankmates places to retreat and can reduce constant territorial confrontations.

Open swimming space should still be available around the rockwork, although this species spends much of its time moving between caves and nearby reef structure rather than cruising continuously through open water. No specialized substrate is required.

A secure aquarium lid is recommended. Like many dottybacks, these quick-moving reef fish can jump when startled or chased.

Diet and Feeding

The Purple Stripe Dottyback is carnivorous. Wild dottybacks feed on small crustaceans, worms, and plankton around reef structure, and this species readily adapts to a varied selection of appropriately sized marine foods in captivity.

Offer mysis shrimp, enriched brine shrimp, finely chopped shrimp, clam or other marine seafood, copepod-based frozen foods, quality carnivore pellets, and complete frozen marine blends. A varied diet is preferable to relying on a single food source.

Feed one to two small meals per day, offering portions the fish can consume quickly without allowing excess food to accumulate within the rockwork.

Temperament and Tankmates

The Purple Stripe Dottyback is territorial and can be surprisingly assertive for its size. Once established, it may aggressively defend caves and nearby rockwork against smaller or more passive fish. FishBase specifically notes aggressive behavior toward other fishes in aquarium conditions.

Avoid pairing it with very timid gobies, small passive basslets, delicate anthias, or other fish likely to be repeatedly intimidated. Other dottybacks and similarly shaped cave-dwelling species may also trigger strong territorial behavior.

It is generally best kept singly in a typical community aquarium. A confirmed compatible pair may be maintained in a larger, heavily structured system, but casually adding two unrelated individuals can result in serious fighting.

Appropriate tankmates include moderately assertive reef fish that are large enough and confident enough to avoid being easily bullied.

Reef Compatibility

Reef safe with caution. The Purple Stripe Dottyback is generally considered safe with corals and is unlikely to damage the reef structure itself. However, its carnivorous feeding behavior means very small ornamental crustaceans and other tiny mobile invertebrates may be viewed as prey.

Large established ornamental shrimp are less vulnerable than very small shrimp, but individual behavior should always be considered. Corals, including SPS and LPS corals, are not typically the primary concern with this species.

For this reason, it is a good candidate for many reef aquariums when its territorial temperament and potential predation on small invertebrates are taken into account.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Its natural tropical habitat falls within approximately 75–79°F, making standard stable reef-aquarium conditions appropriate.

Maintaining consistent salinity, temperature, pH, and overall water quality is more important than continually adjusting the aquarium to reach one exact value within these ranges.

Common Considerations

Territorial despite its size: This small dottyback can dominate considerably more passive tankmates once it establishes a cave or section of rockwork.
Best kept singly: Avoid casually mixing it with other dottybacks or similar cave-dwelling species.
Provide numerous hiding places: Caves and crevices closely match its natural sheltered reef habitat and help reduce stress.
Watch small ornamental invertebrates: Tiny shrimp and other small crustaceans may be treated as prey.
Use a secure lid: Fast-moving dottybacks may jump when startled, chased, or newly introduced.