Royal Gramma Care Guide (2026)

The royal gramma is one of the best saltwater fish for beginner and intermediate reef keepers. Hardy, colorful, and peaceful toward most tankmates, the royal gramma does not require the large tank or intensive management that species like the blue tang demand.

Royal Gramma at a Glance

Scientific name	Gramma loreto
Adult size	3 inches
Minimum tank size	30 gallons
Salinity	1.020-1.025
Reef safe?	Yes
Difficulty	Beginner-friendly

Tank Size

Minimum 30 gallons for a single royal gramma. A 40-55 gallon or larger aquarium is recommended for a community reef tank, depending on the number and size of tankmates. Keep only one per tank. See our Best Saltwater Aquarium Tanks guide.

Water Parameters

Ammonia and nitrite at 0 ppm, nitrate under 20 ppm, salinity 1.020-1.025. Test weekly. See our Best Reef Test Kits guide.

Aquarium Setup

Cave dwellers - provide plenty of rockwork with caves and overhangs. Hovering upside down in caves is normal behavior, not a sign of illness. See our Best Live Rock and Reef Rock guide.

Feeding

Carnivores that accept most foods readily. Frozen mysis shrimp is the best staple. Also accepts pellets, flake, brine shrimp, and copepods. See our Royal Gramma Feeding Guide.

Tankmates

Peaceful toward most reef fish. Territorial toward own species - keep one per tank. Reef safe. See our Royal Gramma Tankmates guide.

Common Health Problems

Jumping: Excellent jumper - use a tight-fitting lid or mesh screen to prevent escapes.
Marine ich: Less prone than blue tangs but quarantine all new fish.
Aggression toward similar species: Keep only one per tank.

See our Royal Gramma Diseases guide.

Is a Royal Gramma Right for You?

An excellent choice for beginner and intermediate reef keepers. Hardy, colorful, reef safe, small tank requirement. Main requirements: adequate rockwork, a tight-fitting lid, and standard reef water quality maintenance.