Bicolor Hammer Coral

Introduction to Hammer Corals

Hammer corals (Euphyllia ancora) are a stunning addition to reef tanks, known for their distinctive hammer- or anchor-shaped tentacles that gently sway in the current. They come in a range of captivating colors, including shades of green, gold, and even bi-color varieties. These Large Polyp Stony (LPS) corals add both movement and visual interest to aquariums, creating a dynamic and natural reef-like aesthetic.

While they are not fully peaceful, Hammer corals are considered semi-aggressive due to their long sweeper tentacles, which can sting neighboring corals if placed too closely. With proper spacing and care, they can thrive and become a focal point in any reef tank.

Location

Hammer corals are native to the Indo-Pacific region, thriving in reef environments from Indonesia and Fiji to the Great Barrier Reef. They are commonly found in lagoonal areas and along reef slopes, where water movement is moderate, and light levels are diffused.

In the wild, these corals anchor themselves to rockwork or rubble in sheltered areas, allowing their tentacles to extend freely while avoiding excessive stress from strong currents. Their placement in these reef zones provides an ideal balance of flow and light, ensuring their long-term health and vibrant appearance.

Water Chemistry

Hammer corals thrive in stable, well-maintained water conditions. Maintaining the following parameters will support their health and vibrant coloration:

• Calcium: 400-450 ppm
• Alkalinity: 8-9.5 dKH
• Magnesium: 1250-1350 ppm
• Nitrates: 5-15 ppm
• Phosphates: <0.10 ppm
• Temperature: 75-80°F
• Salinity: 1.024-1.026

These branching LPS corals are sensitive to fluctuations, so consistent parameters are crucial. Regular testing and adjustments will help ensure a stable environment. Maintaining proper pH levels (8.1-8.4) and stable water chemistry is essential for their skeletal development and overall health.

Lighting

Hammer corals thrive under moderate lighting conditions, typically within a PAR range of 75-150. This level of light allows them to maintain their vibrant coloration and promotes steady growth without risking bleaching or stress. These corals are versatile and can adapt to various lighting setups, including LEDs, T5 fluorescent lights, and metal halides.

At Top Shelf Aquatics, we use a combination of Ecotech Marine Radions and metal halides to replicate the ideal lighting conditions for Euphyllia species in our aquaculture facility. Gradual acclimation to new lighting environments is essential to prevent shock and ensure long-term health.

Water Flow

Hammer corals prefer moderate, indirect water flow, allowing their tentacles to sway gently without being exposed to intense currents. Proper flow helps deliver essential nutrients to the coral while removing waste, supporting both health and growth.

For optimal care, avoid placing these LPS corals in areas with strong, direct flow, as it can cause tissue damage or retraction. At Top Shelf Aquatics, we use a combination of Ecotech Marine MP’s, Reef Octopus Octo Pulse, and Sicce XStream wave makers to create dynamic flow patterns that mimic the coral’s natural habitat. This approach ensures the coral receives the movement it needs to thrive.

What We Feed

Hammer corals rely on their symbiotic zooxanthellae for much of their energy, but supplemental feeding enhances their growth and vibrant coloration. At Top Shelf Aquatics, we feed our Hammer corals a mix of fine-particle foods, such as our Royal Flush blend, which includes:

• Tisochrysis
• Rhodomonas
• Tetraselmis

In addition to fine-particle foods, these Euphyllia species benefit from occasional target feeding with meatier options like mysis shrimp, offered a few times a month. This ensures they receive a balanced range of nutrients for optimal health and growth.

For best results, use a turkey baster to gently target-feed the coral, pausing water flow for approximately 10-15 minutes to allow adequate time for nutrient absorption.

Coloration and Tank Maturity

These corals are prized for their vibrant colors, ranging from bright greens and golds to multi-tone varieties with contrasting tips. Their coloration is influenced by lighting, water quality, and feeding. Deeper blue lighting enhances their vivid hues, while balanced lighting supports consistent growth.

Feeding with nutrient-rich foods, such as mysis shrimp and amino acid blends, contributes to their striking pigmentation. Trace elements like iodine and iron also play a crucial role in maintaining their vibrant appearance and overall health.

With stable parameters and proper care, Hammer corals adapt well to reef systems, rewarding hobbyists with their dynamic movement and bold colors. These corals are known for their steady growth patterns, making them a standout addition to any tank.

Common Challenges

Hammer corals are hardy but can face certain challenges if conditions are not ideal:

• Tissue Retraction: Exposure to strong, direct flow or improper placement may cause the polyps to withdraw, hindering their ability to thrive. Gentle, indirect water movement is key to avoiding this issue.
• Polyp Bailout: Stress caused by unstable water parameters, nutrient imbalances, or poor placement can lead to polyp bailout, where the coral detaches from its skeleton. Maintaining consistent conditions and monitoring stress factors can help prevent this.
• Bacterial Infections: Brown jelly disease is a common issue for Euphyllia species, appearing as a slimy coating. Immediate removal of infected tissue and improved tank hygiene are crucial to controlling its spread.
• Sensitivity to Nutrients: Elevated nitrate or phosphate levels can cause tissue recession or reduced coloration. Maintaining nutrient levels within recommended ranges is essential.
• Lighting Stress: Overexposure to intense lighting can lead to bleaching or tissue damage. Gradual acclimation and appropriate placement in moderate-light zones help mitigate this risk.

How We Farm/Propagate This

At Top Shelf Aquatics, we take great care in farming and propagating Hammer corals to ensure their health and adaptability in home aquariums. Our team of marine biologists rigorously tests and monitors water parameters to maintain ideal water chemistry, supporting optimal growth and coloration. With over 30,000 gallons of farmable water volume, our facility is equipped to cultivate these stunning Euphyllia species under conditions that replicate their natural habitat.

We allow Hammer corals to grow to a suitable maturity before propagation, ensuring they can be cut with bone cutters or coral band saws without undue stress. Each frag is securely mounted using reef-safe glue or epoxy and placed in grow-out tanks where they are closely monitored for health and development. Our sustainable aquaculture practices ensure high-quality corals while promoting responsible reefing.

Acclimation Guide

Proper acclimation is essential for ensuring a smooth transition for your Hammer into your reef system. These corals can experience stress from shipping or environmental changes, so following these steps will help them settle in successfully:

• Temperature Acclimation: Float the bag in your aquarium for 15-20 minutes to equalize temperature.
• Drip Acclimation: Gradually introduce your tank water to the coral.
• Lighting Acclimation: Place the Hammer coral in a lower-light area of the tank or reduce your light intensity initially. Gradually increase lighting over the next 2-3 weeks to avoid bleaching.
• Placement: Mount the coral securely using glue or epoxy on a rock or ledge with moderate, indirect water flow. Monitor its behavior and coloration during the adjustment period.