Ultra Rock Flower Anemones

Ultra Rock Flower Anemones (Phymanthus crucifer)

 

Available for Local Pickup and Shipping

Common Names

• Ultra Rock Flower Anemones
• Rock Flower Anemones
• Ultra RFAs

 

Identification

Scientific Name: Phymanthus crucifer
Adult Size: 3–6 inches (7–15 cm)

Ultra Rock Flower Anemones are among the most colorful and sought-after invertebrates in the reef aquarium hobby. Featuring stunning combinations of fluorescent reds, oranges, yellows, greens, blues, and intricate speckled patterns, each specimen is completely unique. Their exceptional color diversity and relatively easy care requirements make them ideal for both beginner and experienced reef keepers.

 

Behavior & Role in a Reef Tank

Unlike many larger hosting anemones, Rock Flower Anemones typically remain stationary once they have found a suitable location. They prefer to bury their foot in sand or secure themselves within rock crevices while extending their vibrant oral discs to capture light and food.

Because they generally stay in place and tolerate close proximity to one another, Ultra Rock Flower Anemones are perfect for creating beautiful "anemone gardens" filled with multiple colors and patterns.

 

Compatibility & Caution

Ultra Rock Flower Anemones are considered reef safe and are much less prone to wandering than Bubble Tip Anemones. They can coexist with most corals and reef inhabitants when provided with adequate spacing.

Their sting is relatively mild compared to many other anemone species, but nearby corals should still be given sufficient room to prevent irritation.

 

Care Level

Care Level: Easy to Moderate

 

Recommended Water Parameters:

• Temperature: 76–80°F (24–27°C)
• Salinity: 1.025–1.026 SG
• pH: 8.1–8.4
• Alkalinity: 8–10 dKH
• Nitrate: 2–20 ppm
• Phosphate: 0.03–0.10 ppm

 

Lighting:
Moderate to High lighting (PAR 80–200)

 

Flow:
Low to Moderate indirect flow

 

Diet:
Ultra Rock Flower Anemones derive much of their energy through photosynthesis but benefit from supplemental feeding with:

• Mysis shrimp
• Brine shrimp
• Finely chopped seafood
• Reef-specific frozen foods

Feeding once or twice weekly can promote growth, coloration, and overall health.

 

Tank Mates

Suitable tank mates include:

• Clownfish (occasionally may host, though uncommon)
• Gobies
• Blennies
• Wrasses
• Tangs
• Shrimp and other reef-safe invertebrates
• Most peaceful reef fish

Minimum Tank Size: 20 gallons

 

Fun Fact

No two Ultra Rock Flower Anemones are exactly alike. Their incredible variety of colors and patterns has made them highly collectible, and many reef hobbyists dedicate entire sections of their aquariums to creating spectacular Rock Flower Anemone gardens.