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Royal Gramma© Smithsonian Institution from United States / No restrictions

Royal Gramma

The Royal Gramma is a strikingly colored reef fish, its body split neatly into a rich purple front half and a bright yellow rear half. Native to the Caribbean Sea, it favors caves and rocky crevices, tucking itself away and peeking out with just its face showing — an endearing habit that has made it a favorite among aquarists. Its calm temperament and hardiness make it well suited to beginners, and it readily accepts prepared pellets and frozen foods. Staying compact at around 6-8cm as an adult, it can be enjoyed for roughly 5 to 8 years.

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Royal Gramma key facts

Care level
Beginner-friendly
Lifespan
5-8 years
Size
6-8cm
Diet
Pellets, frozen food
Container & Tank
Use a tank of 100L or more with plenty of rockwork forming caves and crevices. Once it claims a home it settles in comfortably.
Diet & Feeding
Hardy and takes prepared food well. Combining pellets with frozen food helps keep it in good condition.
Tank Mates & Compatibility
Peaceful with most fish, but though shy it defends its territory and can be aggressive toward similarly colored fish.
Breeding & Egg-laying
Breeding in captivity is possible to some extent. It nests in rock caves, so provide several hiding spots when keeping a pair.
Notes
Reef-safe — ideal for coral tanks
TraitsBeginner-friendlyBeautifulCave-dwellerReef-safe

About Royal Gramma

A guide to keeping Royal Grammas: purple-and-yellow coloring, cave-dwelling habits, a 5-8 year lifespan, and 6-8cm adult size for prospective keepers.

7 things to know before welcoming a Royal Gramma

  1. 1Provide Hiding Spots

    Royal Grammas love caves and rocky crevices to retreat into. Stack live rock to create several hiding spots so it feels secure and shows itself more often. Without enough cover, it tends to stay tucked away.

  2. 2Easy to Feed

    This species readily accepts prepared pellets and frozen foods, making feeding straightforward even for beginners. Since it may stay near its hiding spot, offer small amounts and watch to confirm it's eating.

  3. 3Swims Upside Down

    Inside caves and crevices, Royal Grammas often swim tilted or upside down. This is normal behavior for the species, not a sign of illness, so there's no need to worry when you see it.

  4. 4Can Be Territorial

    Despite its calm nature, it can be territorial toward its own kind or similarly shaped, similarly colored fish. If keeping more than one, provide a larger tank with plenty of hiding places.

  5. 5Cover the Tank

    Startled fish may dart suddenly and jump out of an open tank. Use a tight-fitting lid or cover any gaps to prevent jumping accidents.

  6. 6Lifespan of 5-8 Years

    With proper care, Royal Grammas typically live 5 to 8 years. Since this is a long-term commitment, keep up consistent water quality maintenance and hiding spots throughout its life.

  7. 7Adult Size of 6-8cm

    Adults stay compact at around 6-8cm, making them manageable in small to medium tanks. Keep this size in mind when planning tankmates and aquascape layout.

Frequently asked questions about Royal Gramma

Q.Is the Royal Gramma suitable for beginners?
A.Yes, it's considered a beginner-friendly saltwater fish. It readily eats prepared pellets and frozen foods and is hardy and easy to keep. Just be sure to provide rockwork it can hide in.
Q.Can it be kept with other fish?
A.Its temperament is fairly calm and generally suits community tanks, though it can be territorial toward its own kind or similarly shaped and colored fish. If keeping more than one, give them a larger tank with plenty of hiding spots.
Q.How big does it grow?
A.Adults stay compact at around 6-8cm. That makes it a good fit for small to medium tanks.
Q.What is its lifespan?
A.With proper care, it typically lives 5 to 8 years. Since it's a long-term companion, consistent water quality maintenance is important.
Q.What should I feed it?
A.It readily accepts prepared pellets and frozen foods. Since it may stay near its hiding spot, offer small amounts and watch to confirm it's eating.

Useful tools for Royal Gramma care

💧Aquarium Volume CalculatorCalculate water volume, weight, and heater wattage from tank dimensions🧪Water Quality CheckerFind compatible fish, shrimp, plants & corals based on pH, temperature & hardness🍽️Feeding GuideCheck feeding frequency, portion sizes & supplements by species and growth stage🤝Compatibility CheckerCheck compatibility between two species on a 5-level scale📊Fish Compatibility MatrixCheck fish compatibility at a glance with our matrix chart🔄Nitrogen Cycle GuideAuto-calculate bacteria colonization timeline for new tank cycling🗓️Seasonal Care CalendarMonthly care events and seasonal management tips at a glance🚿Water Change CalculatorAuto-calculate optimal water change frequency and volume by tank size and fish count🐠Stocking CalculatorCalculate max fish capacity for your tank size with overstocking alerts🏞️Tank Layout PlannerGet substrate, plant & hardscape suggestions based on tank size and style🧮Care Cost SimulatorEstimate initial, monthly & annual costs by category, care level and quantity⚖️Species Comparison ToolCompare two species side by side: care difficulty, size, lifespan & temperature🎯Pet Match DiagnosticAnswer 7 questions to find your top 3 perfect pets🚚Transport Safety CheckerCheck transport safety score and precautions by category, season, method and distance⏱️Quarantine & Acclimation TimerManage quarantine periods and acclimation steps with countdown timers. Includes recommended durations by species

Learn more about Royal Gramma in the encyclopedia

View Royal Gramma encyclopedia entry →

Care difficulty, lifespan, size and diet — all basics covered.

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