Euphyllia like Hammer corals are found all over the tropical waters of the Pacific. In particular, they are regularly harvested from the islands of the Indopacific including Fiji, Tonga, Solomon Islands, and the Great Barrier Reef.
Hammers, Torches, and Frogspawn (Euphyllia sp.) do not require as much light as some other corals. It can be kept under normal output fluorescents without much difficulty. In some cases, Torches may extend more readily under subdued lighting, however it may display more attractive colors when placed under stronger lighting.
Moderate to strong water movement is recommended. One of the main draws to this type of LPS coral is how it sways in the current. Water flow is both healthy for the Hammer and is pleasing aesthetically.
Hammer corals require consistent levels of calcium, alkalinity, and to a lesser degree magnesium in order to grow their calcium carbonate skeletons. The amount of supplementation needed to maintain calcium, alkalinity, and magnesium depends a lot on the size and growth rate of the stony corals in your tank. Higher densities of stony corals consume these compounds at a faster rate than sparsely populated aquariums.
Like most coral, Euphyllia rely to a large extent on the products of their zooxanthellae, however, in our experience, they also benefit from direct feeding. Hammers, torches, and frogspawn do not seem to aggressively feed like other LPS, so finding the right food can be a challenge.
Corals developed all kinds of adaptations to gain a competitive advantage in the battle for real estate on the reef. In our home aquariums we have to be conscious of these in order to create the best environment for them long term. Euphyllia are one of the corals that extends long sweeper tentacles. Sweeper tentacles are often used as a means of defence against other encroaching coral colonies. Their white tips contain a concentration of nematocysts that can damage more delicate tank mates. Most of the time, this is not a major problem but to be safe, we recommend placing it in a location far from other corals initially.