Hammer Coral

The Euphyllia Hammer Coral is a large polyp stony (LPS) coral and often referred to as Ridge, Hammerhead, or Anchor Coral. Its common names are derived from the appearance of its hammer-, or anchor-shaped tentacles. Its polyps are visible throughout the day and night and hide its skeletal base. It may be green, tan, or brown in color, with lime green or yellow tips on the ends of its tentacles that glow under actinic lighting. Some varieties may be branched which makes them look similar to a Torch Coral (E. glabrescens).

Euphyllia ancora

Quick Stats: Hammer Coral

Family: Caryophylliidae
Polyp Size: LPS - Large polyp stony
Range: Indo-Pacifc
Color Form: Green, Tan, Brown
Ideal Supplements: Calcium, Strontium, Trace elements
Reef Compatible: Yes
Tank Conditions: 72-78ºF; sg 1.023-1.025; pH 8.1-8.4
Water Flow: Medium
Light: Medium
Dominance: Aggressive
Placement: Low
Care Level: Moderate




It is moderately difficult to maintain, but with proper water conditions in the aquarium, it will thrive. It will require a medium light level combined with a medium water movement within the aquarium. At night, its sweeper tentacles can extend up to six inches in the reef aquarium, stinging other species of corals and animals. Allow plenty of room between it and other neighboring corals. For continued good health, it will also require the addition of calcium, strontium, and other trace elements to the water.

It will benefit from additional food fed weekly in the form of micro-plankton or brine shrimp.