Euphyllia divisa (Abrolhos Islands)

• Indo-Pacific
• Moderate Care Level
• For Intermediate to Advanced Hobbyists
• Moderate to High Placement in Reef Tank

Euphyllia divisa, a species of Large Polyp Stony (LPS) coral, is often known as Branching Hammer Coral due to its characteristic branching structure and hammer-shaped polyps. The Abrolhos Islands variant of Euphyllia divisa is a particularly vibrant and colorful form, found predominantly around the Abrolhos Islands off the coast of Western Australia. This species is renowned for its brightly colored polyps, which typically feature a mix of green, blue, and purple hues, with bright tips that can range from yellow to bright green. The polyps themselves have a unique, branching formation that gives the coral a tree-like structure.

Euphyllia divisa can form large, dense colonies that extend outward, creating a captivating and flowing appearance in the aquarium. This species, like others in the Euphyllia genus, exhibits a high degree of polyp extension, making it a visually striking addition to any reef tank. The polyps are long and sway gracefully in the water flow, giving the coral a dynamic presence. Due to its beautiful appearance and unique structure, it is a highly sought-after coral for reef hobbyists.

Placement in the Tank

Euphyllia divisa (Abrolhos Islands) requires moderate to high lighting to maintain its vibrant colors and healthy growth. A light intensity of 150-250 PAR is ideal for this species, and while it can adapt to lower lighting, its coloration and polyp extension will be enhanced under stronger lighting. Position the coral in the middle to upper regions of the tank to allow it to receive proper lighting, but avoid placing it in areas where it could be exposed to direct intense light, which could lead to stress or bleaching.

When it comes to water flow, Euphyllia divisa prefers moderate water movement. Too strong a current can cause its polyps to retract or suffer damage, while stagnant water can impede its ability to capture food and reduce its overall health. A gentle to moderate flow will allow the polyps to sway gracefully without being damaged, while still allowing the coral to effectively feed on planktonic organisms.

Water Parameters

To maintain optimal health, it is important to replicate the conditions of the Indo-Pacific environment. The following water parameters are ideal for Euphyllia divisa:

• Temperature: 24°C to 28°C (75°F to 82°F), with 26°C (79°F) being optimal.
• Salinity: 1.023–1.025 specific gravity (SG), with 1.024 being ideal.
• pH: 8.0 to 8.4, with 8.2 being optimal for maintaining a stable environment.
• Alkalinity (dKH): 8-12 dKH, with 9-10 dKH being ideal for healthy skeletal development.
• Calcium: 400-450 ppm is necessary to support the coral’s skeletal growth.
• Magnesium: 1250-1350 ppm helps stabilize calcium and alkalinity levels.
• Nitrate: Less than 5 ppm to prevent nutrient imbalances and algae growth.
• Phosphate: Below 0.03 ppm, as elevated phosphate levels can inhibit the coral’s growth and promote unwanted algae.

Feeding

Euphyllia divisa (Abrolhos Islands) is primarily photosynthetic, relying on the zooxanthellae algae that live within its tissue to produce food through photosynthesis. However, it is also a filter feeder and benefits from occasional supplemental feeding.

Supplemental feedings should include small planktonic foods, such as mysis shrimp, brine shrimp, zooplankton, or phytoplankton. A feeding schedule of 1-2 times per week is usually sufficient to ensure it receives the nutrients it requires. Feed the coral using targeted feeding techniques like a turkey baster or pipette to ensure the food reaches the polyps. Be cautious not to overfeed, as this can lead to water quality issues and nutrient imbalances.

Maintenance and Care

Proper care and regular maintenance will help Euphyllia divisa (Abrolhos Islands) thrive:

• Water Changes: Perform 10-15% weekly water changes to maintain high water quality and prevent the buildup of harmful toxins.
• Water Parameter Monitoring: Regularly check pH, calcium, nitrate, phosphate, and alkalinity to ensure the parameters remain within the optimal range.
• Space for Growth: Provide ample space between the coral and other species, especially those with aggressive tentacles, such as SPS corals or other long-tentacled LPS corals. Euphyllia divisa can grow into large colonies, so ensure there is enough space for it to expand without competition.
• Pest Control: Monitor for pests like Aiptasia, flatworms, or nudibranchs. These pests can damage or kill the coral, so remove them promptly if detected.

Compatibility

Euphyllia divisa (Abrolhos Islands) is a peaceful coral that does well in tanks with other non-aggressive corals. It can be housed with other LPS species such as Blastomussa, Favia, and Acanthastrea. However, because it can be territorial and its long tentacles may sting neighboring corals, it should be placed away from aggressive species such as SPS corals and other long-tentacled LPS species. This species should be kept in a reef tank with corals that can tolerate its presence without direct competition for space.

Conclusion

Euphyllia divisa (Abrolhos Islands) is a stunning LPS coral that adds both color and movement to a reef tank. With its vibrantly colored polyps, branching structure, and flowing appearance, it makes a captivating centerpiece for intermediate to advanced hobbyists. By providing the right lighting, water flow, and space for growth, this species can thrive and develop into a large, impressive colony over time. Its moderate care requirements and peaceful nature make it an excellent choice for those looking to add beauty and dynamism to their aquarium while ensuring a stable and healthy tank environment.