Hammer Wall Green CoralHammer Wall Green Coral A large polyp stony (LPS) coral and referred to as Euphyllia Hammer or Anchor coral. Its polyps are visible throughout the day and night and hide its skeletal base. They 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. Also some may be branched which makes them look similar to torch coral. Approximate size: 3 to 6 inches