Scooter Blenny - Ruby Red Dragonet (Synchiropus sycorax)

The Ruby Red Dragonet is one of the most visually extraordinary small fish available in the marine hobby, and one of the most genuinely demanding. Synchiropus sycorax was only formally described as a species in 2016, its scientific name a nod to the crimson-robed Sycorax warriors from Doctor Who in recognition of its dramatic colouration, and it entered the aquarium trade shortly before that to immediate and well-deserved excitement. Its body is a deep, saturated ruby red overlaid with intricate white markings across the head, with vivid yellow and orange accents on the ventral and pectoral fins. Males display an elaborate, flag-like first dorsal fin that they raise in dominance displays and courtship rituals with a theatrical flair that is genuinely captivating to watch up close. Despite being commonly sold under the name Scooter Blenny, this fish is not a blenny at all but a dragonet in the family Callionymidae, sharing the same specialised feeding biology as the Mandarin Dragonet. That biology is the central challenge, and the central commitment, that this fish demands. Get the environment right, and it rewards you with some of the most jewel-like colour in the hobby.

Why we love it

• One of the most intensely coloured small reef fish available in the trade; the deep ruby-red body with white head markings and yellow fin accents is genuinely striking under any lighting condition
• Males display a spectacular flag-like first dorsal fin used in courtship and dominance rituals that is one of the most entertaining behavioural displays of any nano reef fish
• Completely reef safe with corals and all sessile invertebrates
• A peaceful, unhurried bottom-dweller that picks methodically across rockwork and substrate throughout the day, adding life and movement to the lower levels of a reef
• Captive-bred specimens are available through a small number of specialist breeders, and represent a meaningfully hardier and more adaptable option than wild-caught fish when they can be sourced

Suggested parameters

• Temperature: 22–26°C (72–78°F)
• Salinity: 1.020–1.025 SG
• pH: 8.1–8.4
• Alkalinity: 8–12 dKH
• Ammonia/Nitrite: 0
• Nitrate: As low as achievable; this species requires the kind of stable, mature water chemistry that only a well-established, biologically rich system can provide

Care and temperament

• Difficulty: Difficult. This is not a fish for new hobbyists or for systems that cannot sustain a thriving live microfauna population
• Temperament: Peaceful with all fish that are not male dragonets; males will engage in intense dorsal fin displays and physical confrontations with rival males of the same or similar dragonet species
• Reef safe: Yes. Completely safe with corals, sessile invertebrates, and all but the very tiniest motile crustaceans
• Minimum tank size: 30 gallons for a single specimen, with abundant live rock and a live sand bed; 55 gallons or larger is required if keeping a male with multiple females, and provides a meaningfully larger pod reservoir to draw from

Diet

Feeding is the defining challenge of keeping any dragonet, and the Ruby Red is no exception. In the wild, this species spends its entire day methodically hunting and consuming live copepods and amphipods from the substrate and rockwork. Replicating that in captivity requires genuine infrastructure, not just frequent feedings.

• Live copepods and amphipods are the dietary foundation; a connected, mature refugium producing a continuous supply of microfauna is strongly recommended and dramatically improves long-term outcomes, particularly in the critical first months
• Regular additions of live copepod cultures directly to the display supplement refugium production and are especially important in the early settling period
• Some individuals, particularly captive-bred specimens, can be trained to accept frozen cyclops, baby brine shrimp, and finely crushed frozen mysis; this transition should be pursued patiently and consistently, as frozen food acceptance significantly improves long-term prospects
• This species feeds slowly and deliberately throughout the day; it must not be outcompeted at feeding time by faster or more aggressive tankmates
• Never house with other dragonet species unless the system is large enough to sustain the combined pod demand of all individuals; even in large systems, pod depletion is cumulative and silent until the fish begin to visibly decline

Compatibility and tankmates

• Ideal tankmates are small, peaceful, non-competitive fish that do not share the same food source: small clownfish, cardinalfish, assessors, peaceful basslets, jawfish, and small non-dragonet gobies are all suitable
• Avoid all fast, boisterous, or assertive fish that will outcompete it at feeding time; a hungry dragonet will decline and waste away quickly without any visible conflict
• Never keep with anemones; this docile bottom-dweller does not recognise anemones as predators and will wander into tentacle reach with predictable results
• Only one male per system; two males will display and fight, with the loser suffering chronic stress even if not physically injured
• Multiple females can be kept together, or a harem of one male with two to three females in a sufficiently large system; all individuals should be introduced simultaneously
• Avoid hawkfish, dottybacks, damsels, and any predatory or persistently aggressive species

Health and acclimation notes

The single greatest risk to the Ruby Red Dragonet is starvation, and it is a risk that is easy to underestimate because this fish declines gradually and quietly. A dragonet that is not getting enough live food will slowly lose body condition over weeks before the keeper notices, and by the time visible emaciation is apparent the fish is in serious difficulty. Purchasing this fish only for a system that already has a functioning refugium, an established live sand bed, and a documented pod population is the most responsible approach. When selecting a specimen, look for a fish with a rounded, full belly and active, exploratory behaviour; avoid any individual that appears thin across the midsection or lethargic. Captive-bred specimens are significantly preferable to wild-caught when available, as they are better adapted to aquarium foods and conditions from the start. A tight-fitting lid is essential; like all dragonets, this species is a capable jumper when startled. Avoid housing with sea anemones of any kind.

What you are buying

• You will receive: 1 Ruby Red Dragonet (Synchiropus sycorax)
• Males display a prominent, elongated first dorsal fin and more intense colouration; females have a shorter dorsal fin and slightly paler body tone
• Colouring intensity can vary between individuals and improves significantly with a rich, live-food diet in a mature system
• Size may vary; please see size options at checkout
• Due to the dietary demands of this species, we strongly recommend having a mature, refugium-equipped system with an established pod population ready before purchasing