Hammer coral, also known as Euphyllia ancora, is a beautiful and popular addition to many reef aquariums. To properly care for hammer coral, there are several key factors to consider. First and foremost, ensure that your water parameters are stable and within the appropriate ranges for a reef tank. This includes maintaining proper temperature, salinity, pH, and nutrient levels. Lighting is crucial for hammer coral, as they require moderate to high levels of light. Provide a suitable light source, such as LED fixtures, and ensure proper light intensity and duration. It’s important to maintain good water flow around the coral to prevent debris from settling and to encourage optimal growth. Regularly monitor and maintain water quality by conducting routine water changes and testing for essential parameters. Feed your hammer coral a varied diet of small meaty foods, such as brine shrimp or mysis shrimp, and consider supplementing with coral-specific foods or additives. Lastly, keep an eye out for any signs of stress or disease, such as tissue recession or discoloration. If you notice any issues, take immediate action by adjusting water conditions or seeking assistance from a knowledgeable aquarium professional. With proper care, your hammer coral can thrive and become a stunning centerpiece in your reef aquarium.