Royal Gramma Care Guide: Tank Size, Diet, Caves & Reef-Safe Tips

The Royal Gramma (Gramma loreto) is a small Caribbean basslet famous for its split personality colors: a vivid violet-purple front that fades into bright golden yellow toward the tail. Also sold as the Fairy Basslet, it stays around 3 inches, accepts frozen and prepared foods readily, and is completely reef-safe with corals and most invertebrates.

This care guide covers tank size, cave aquascaping, diet, temperament, jump risk, and stocking tips so you can keep one healthy long-term. When you are ready to buy, compare seller photos and QT notes in the ReefBay marketplace against the targets below.

@ReefShaQ

Quick care snapshot

• Scientific name: Gramma loreto
• Also called: Fairy Basslet, Royal Gramma Basslet
• Category: Basslet / Fairy Basslet
• Origin: Western Atlantic / Caribbean
• Care level: easy
• Temperament: peaceful toward dissimilar tankmates; territorial around its cave and with lookalikes
• Reef-safe: yes (corals and inverts)
• Suggested tank: 30+ gallons
• Max size: about 3.0 inches
• Social: solitary (one per tank in most systems)
• Diet: carnivore — mysis, brine shrimp, frozen and prepared meaty foods
• Jump risk: yes — use a tight-fitting lid

Tank size, caves, and aquascape

Plan on a mature 30-gallon or larger reef with plenty of live rock. Royal Grammas are cave specialists. They pick an overhang or hole, hang upside-down or sideways inside it, and defend that real estate more than they cruise open water.

• Build multiple caves and ledges so the gramma can claim one without boxing out every neighbor
• Moderate or slightly subdued lighting near their hangout is fine; they do not need a high-PAR blast zone
• Keep flow present but not a firehose into the cave mouth
• Lid required: startled grammas are known jumpers, especially in the first weeks

In a nano under 30 gallons, one well-fed fish with a dedicated cave can still work if bioload and aggression stay low. Larger community reefs give everyone more room to avoid cave disputes.

@Rose_etink

Diet and feeding

Royal Grammas are carnivores that usually learn frozen foods fast. Stick to mysis, brine shrimp, and quality meaty prepared foods (pellets or frozen blends).

1. Feed 1–2 times daily in amounts they finish in a couple of minutes
2. Target food near their cave if shy tankmates or faster fish steal mid-water meals
3. Rotate foods so color and condition stay high
4. Watch weight: a sunken belly often means competition, not “won’t eat ever”

Most healthy grammas become bold at feeding time once they trust the routine. Track appetite in the ReefBay app so you notice a skip day early.

Temperament and tank mates

Toward clownfish, gobies, firefish, chromis, and most peaceful wrasses, Royal Grammas are model citizens. The friction shows up when another fish wants the same cave, or when you add a second gramma / similar purple-yellow basslet in a small tank.

• Good neighbors: clownfish, firefish, watchman gobies, chromis, peaceful wrasses, soft/LPS coral tanks
• Risky: another Royal Gramma in under ~75 gallons; similar basslets or aggressive dottybacks; very tiny ornamental shrimp if the individual is a hunter
• Stocking tip: add the gramma after peaceful mid-water fish are settled, or give it a pre-built cave before flashier diggers arrive
• Quarantine: still QT — hardy does not mean disease-proof

@singwithmylife

Behavior quirks worth knowing

Expect a fish that “lives in the rock.” Many owners see a purple head poking from a hole more than a constant mid-water swimmer. Upside-down hanging under ledges is normal, not a swim-bladder emergency.

• Head-shaking or brief dashes at fish near the cave is usually a warning, not a full attack
• Some individuals stay shy for weeks; others follow clownfish around once comfortable
• Night hiding is normal; daytime total invisibility plus refusal to eat is the red flag

@Gabe169

Buying checklist (marketplace)

Before you click buy on ReefBay, sanity-check the listing:

• Clear photos or video of the actual fish (both purple and yellow halves visible)
• Actively eating frozen or pellets in QT
• No clamped fins, rapid breathing, or white spots
• Seller notes on temperament and tank size the fish came from

Browse current Royal Gramma and basslet listings in the ReefBay app marketplace, then match tank size and cave space before shipping day.

@Qwarex

Common problems and quick fixes

• Hides constantly / won’t eat: reduce chasey tankmates, feed nearer the cave, dim harsh lighting briefly at feed time
• Cave bullying: add more rock voids or re-scape so there is more than one “best” hole
• Jumped: seal lid gaps around cords and overflow; acclimate lights-out with cover on
• Faded color: increase meaty feed variety and check nitrate/phosphate aren’t crashing appetite

Bottom line

If you want an easy, reef-safe splash of Caribbean color that does not demand a huge swimming lane, the Royal Gramma is hard to beat. Give it a 30+ gallon mature tank, a cave it can own, a tight lid, and steady meaty foods—and it will earn a permanent spot in your rockwork. Ready to shop? Open ReefBay, filter for Royal Gramma / Fairy Basslet, and pick a well-QT’d specimen that is already eating.