🐠 Masked Grouper (Gracila albomarginata)
🐠 Masked Grouper (Gracila albomarginata)
Marine Not-Reef-Safe Predatory Fish • Reddish-Brown Body With Curved Dark Bars & a White Flank Patch • Genuine Blue-Glowing Marking Under Natural Light • Advanced Marine Fish
📋 The Masked Grouper, also known as the Thinspine Grouper, White-Margined Grouper, or Slenderspine Grouper, has a genuinely distinctive greenish-to-reddish-brown body marked with narrow, curved dark bars, a dark spot on the tail base, and a genuinely notable square white patch on the upper flank that appears blue when viewed under natural light.
Native to a genuinely wide range across the Indo-Pacific, from northern Mozambique to French Polynesia, and north to Okinawa, this species inhabits reef environments at depths of 15 to 120 metres.
This is a genuinely solitary, territorial species best kept alone, or alongside other large, robust fish capable of tolerating its semi-aggressive temperament. We want to be honest that it can genuinely be shy and difficult to feed in its first days in a new aquarium, sometimes requiring live glass shrimp or small fiddler crabs to encourage feeding if it won't accept anything else. It's genuinely a low-metabolism species, needing to be fed only every other day once established. We want to be upfront: this species is not reef safe, and will genuinely consume ornamental fish and invertebrates small enough to fit in its mouth.
🟤⚪ Highlights
🎨 Curved Dark Bars & White Flank Patch: A genuinely distinctive marking that glows blue in natural light
💎 Genuinely Uncommon in the Trade: A distinctive find for serious FOWLR keepers
⚠️ Genuine Initial Feeding Difficulty: May require live foods to start eating
⚠️ Not Reef Safe: Will consume ornamental fish and invertebrates it can fit in its mouth
😌 Genuinely Becomes Social: Shy at first, more confident with time
🧾 A Quick Look at the Masked Grouper
📛 Common Name: Masked Grouper (Thinspine Grouper, White-Margined Grouper)
🔬 Scientific Name: Gracila albomarginata
👨👩👧 Family: Epinephelidae
🌍 Origin: Indo-Pacific (northern Mozambique to French Polynesia, Okinawa to northern Great Barrier Reef)
📏 Max Size: Up to 40 cm (≈ 16")
🧂 Specific Gravity: 1.020–1.025
🌡️ Temperature Range: 22–26°C (72–78°F)
🧠 Care Level: Moderate to Advanced
💖 Temperament: Semi-Aggressive; genuinely solitary and territorial
🌿 Reef Safe: ❌ No — will consume ornamental fish and invertebrates it can fit in its mouth
🏠 Min Tank Size: 470 L (≈ 125 gallons)
📌 Tank Level: Lower to Mid Level
🧬 Stock Type: Wild-collected as standard stock; genuinely uncommon in the trade
⏳ Lifespan: 8–10 years+ with proper care
🍽️ Diet: Carnivore (marine fish and crustacean flesh, clams, meaty foods)
🐣 Reproduction: Protogynous hermaphrodite; genuinely not bred in home aquariums

















