Green Hammer Coral
Euphyllia paraancora
Stunning fluorescent green branching hammer coral. This LPS coral features classic anchor-shaped tentacle tips. Requires stable calcium, alkalinity, and magnesium levels to grow its skeleton. Ideal for established reef aquariums with moderate flow and light.
- Lighting
- Medium
- Flow
- Medium
- Placement
- Lower Mid
- Temperament
- Aggressive, has sweeper tentacles that can sting nearby corals. Give it at least 6 inches of space.
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Care guide
Keeping Euphyllia in a reef tank
Branching hammer carries the same hammer-tipped tentacles as its wall-forming relative, but on a branching skeleton where each head sits on its own stalk. Euphyllia paraancora is the more practical choice of the two: heads can be separated cleanly at the branch, so the colony is straightforward to propagate and to recover if part of it is lost.
Lighting for Green Hammer Coral
Moderate light is plenty, and this genus is easy to overdo. Under too much intensity the polyps stay tightly withdrawn and the tissue pales; under appropriate light they inflate well beyond the footprint of the skeleton. This particular frag is rated for medium light — roughly 100–200 PAR, around the middle of the rockwork.
Water flow
Gentle to moderate, indirect flow lets the polyps inflate fully. Strong direct current keeps them permanently deflated, and over time that suppressed extension shows up as stalled growth. Flow for this frag should be moderate and variable.
Placement and tank mates
Lower Mid. Aggressive, has sweeper tentacles that can sting nearby corals. Give it at least 6 inches of space..
What to watch for
Euphyllia deploy long sweeper tentacles after lights-out that reach well past their daytime footprint, so leave four to six inches to any non-Euphyllia neighbour. Brown jelly disease is the serious risk in this genus and moves fast — a colony showing it should be removed and dipped rather than watched.
