Blue Saltwater Aquarium Fish Guide: Top Blue Species
Blue is the colour of a reef. This blue saltwater aquarium fish guide from Gensou Aquascaping at 5 Everton Park walks through the top blue species SG reefers stock, the tank-size requirements and the SGD pricing at local shops. From the workhorse blue-green chromis to the royal blue tang made famous by Hollywood, each species carries its own care profile and compatibility quirks, and two decades of local reef builds have taught us which blues settle in and which chase nipping trouble.
Blue-Green Chromis — The Schooling Starter
Chromis viridis is the cheapest blue staple at SGD 7-12 per fish at Iwarna, Pinnacle or C328. They reach 8 cm, accept any prepared food and school convincingly in groups of five or more. Peaceful for 30 days, then dominance fighting begins and groups collapse to one or two survivors. Buy odd numbers — seven or nine — to spread aggression, in a minimum 90-gallon tank for long-term harmony.
Royal Blue Tang — The Dory Fish
Paracanthurus hepatus grows to 30 cm and needs a 180-gallon minimum with strong flow. Tank-bred juveniles from Bali Aquarich arrive at SG shops at 3-5 cm, priced SGD 120-250 depending on size. They are gentle community fish but white-spot prone — quarantine with copper (Cupramine SGD 35) for 30 days before the display. Feed nori strips three times weekly; fortified mysis daily.
Blue Damsel — Beautiful Bully
Chrysiptera cyanea is an intense electric blue at SGD 12-20. Gorgeous as a solo specimen in a 30-gallon nano or a single sentinel in a mid-size reef. Warning: turn aggressive with age and territory. Adding a blue damsel first prevents later fish from settling in. Either add last, add in a tank with plenty of rockwork, or skip unless you commit to removing it if behaviour deteriorates.
Yellowtail Blue Damsel — Nano Friendly
Chrysiptera parasema is less territorial than the common blue damsel and well-suited to a 30-gallon nano. Striking electric-blue body with a bright yellow tail. Peaceful with clownfish and gobies in groups of three. Priced SGD 15-25 at local shops. Tank-raised specimens often carry better temperament than wild imports.
Blue Reef Chromis — The Calm Cousin
Chromis cyanea, the true blue reef chromis, runs deeper indigo than viridis and stays peaceful through adulthood. More expensive — SGD 25-40 per fish — and stocked less consistently in SG, but worth asking for at specialist importers. Keep in groups of five to seven in a 120-gallon plus. Pairs well with fairy wrasses and anthias for a natural reef look.
Powder Blue Tang — Expert Level
Acanthurus leucosternon is stunning and genuinely difficult. Extreme ich susceptibility requires rigorous quarantine, prophylactic copper and tank transfer method. Prices SGD 180-300 reflect the survival gamble. Needs 180-gallon minimum with 40x turnover flow. Do not consider as a beginner. Gensou recommends two years of tang experience before attempting.
Blue-Jaw Triggerfish — Reef Safe Exception
Xanthichthys auromarginatus is one of few genuinely reef-safe triggers. Males display a vivid blue lower jaw and grow to 25 cm. Priced SGD 150-250 at good SG stockists. Needs 180-gallon with open swimming space. Peaceful with most tankmates except smaller ornamental shrimp, which become lunch. Pair with tangs, wrasses and angelfish for a bold reef community.
Blue Spot Jawfish — Sand Sculptor
Opistognathus rosenblatti digs and maintains elaborate burrows in a deep sandbed. Brilliant blue spots across a sandy body. Needs 75-gallon minimum with 10 cm sand layer, mixed rubble for burrow stability, and a tight lid — they jump. Priced SGD 180-280. Temperature-sensitive, wanting 22-24°C, which means a strong chiller in SG. Feed small frozen daily; they lunge, grab and retreat.
Blue Mandarin — Dragonet Grace
Synchiropus splendidus wearing the blue-green phase is the famed dragonet of YouTube. Psychedelic patterns, slow swimming, constant pod-hunting. Not a starter fish — needs a mature 75-gallon with established copepod populations and often a dedicated refugium. Train onto frozen mysis or cyclop-eeze in a breeder net before display release. Priced SGD 60-120; tank-bred ORA specimens cost more but eat prepared food reliably.
Compatibility and Sourcing Notes
Mix blue species with yellow, orange and purple for colour contrast — a royal blue tang next to a yellow tang reads like a postcard reef. Buy from shops that quarantine (Iwarna, Pinnacle, selected Thomson importers) and always run a separate QT tank at home for 30 days minimum. A thoughtful blue saltwater aquarium fish guide stocking plan paces additions over six months, and SG reefers who skip rushing build reefs that stay peaceful for years.
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5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
