Holy Grail Torch Care Guide
Holy Grail Torch (Euphyllia glabrescens var. 'Holy Grail') is a LPS coral. Care covers 75-175 PAR, medium flow, reef parameters and feeding; advanced level.
Compiled by Aquairi from published sources · Published · Updated
Overview
Holy Grail Torch (Euphyllia glabrescens var. 'Holy Grail') is a LPS coral in the family Euphylliidae. Legendary collector torch with metallic green-gold tentacles and bright pink tips. Among the most coveted designer Euphyllia morphs.
Taxonomy
- Family: Euphylliidae
- Genus: Euphyllia
- Scientific name: Euphyllia glabrescens var. 'Holy Grail'
- Common synonyms: HG Torch, Holy Grail
Habitat
In the wild, Euphyllia glabrescens var. 'Holy Grail' is reported from Indo-Pacific, where it occupies mid to lower reef slopes and lagoons (typically 5-30 m). The species adopts a branching growth form on hard substrate within zooxanthellate reef communities.
Tank requirements
- Salinity (specific gravity): 1.024-1.026
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- Carbonate hardness (dKH): 8-11
- Calcium: 400-450 ppm
- Magnesium: 1280-1350 ppm
- Phosphate (max): 0.03 ppm
- Nitrate (max): 5 ppm
- Minimum system age: 6 months
Placement and lighting
- PAR (placement zone): 75-175 PAR
- Water flow: medium
Mount this LPS coral on the lower or mid rockwork or on the sand bed (for free-living forms) where light is moderate. Strong direct flow can damage the fleshy tissue; aim for indirect, varied movement.
Feeding
Euphyllia glabrescens var. 'Holy Grail' hosts symbiotic zooxanthellae and derives most of its energy through photosynthesis. Supplemental target feeding accelerates growth and supports colouration; commonly accepted items include mysis, reef-roids, amino-acids. Feed once or twice per week after lights-out, when polyps are extended.
Compatibility
This coral is aggressive toward neighbours. It extends sweeper tentacles capable of stinging adjacent corals, so leave generous spacing (10-20 cm) between colonies. Reef-safe with most fish and invertebrates.
Care notes
Difficulty level: advanced. Reported skeletal growth in well-tuned reef tanks is approximately 0.1-0.3 cm/month. Propagation by fragmentation is straightforward for branching colonies — separate branches or polyps with a bone cutter, glue to plug, allow 1-2 weeks for healing. Maintain stable alkalinity (avoid swings above ±0.5 dKH per day) to preserve tissue health.
Holy Grail Torch (Euphyllia glabrescens) Propagation Guide
Overview
The Holy Grail is a sought-after color morph of Euphyllia glabrescens, the torch coral, a large-polyped stony coral in the family Euphylliidae. Euphyllia glabrescens forms colonies with a phaceloid skeleton, where tubular corallites roughly 20-30 mm in diameter sit on separate branches spaced 15-30 mm apart. This branching skeletal structure is what makes torch corals amenable to fragging.
Reproductive Mode
In the aquarium, Euphyllia glabrescens is propagated asexually by fragmentation. Because each polyp head grows on its own length of tubular skeleton, a colony can be divided into individual heads that each regrow into a new colony over time. Reef Builders describes torch corals as relatively easy to frag thanks to this distinct branching skeleton, with single heads removed and grown out to repeat the cycle.
Fragging / Asexual Propagation
- Identify the gaps in the skeleton between corallite heads; plan cuts so each frag keeps a length of its own skeleton.
- Cut through the bare skeleton between heads with coral cutters or a band saw, which gives a cleaner flat edge.
- Avoid cutting through the fleshy polyp tissue itself; work between the heads.
- Dip the new frags in a coral dip to remove pests, as is done when reshaping a Holy Grail torch colony.
- Glue or epoxy each frag to a plug and place it in low flow and moderate light until the tissue recedes from the cut and heals.
A torch colony can be grown from a single corallite into roughly a dozen polyps over about two years, after which it can be fragged again.
Conditions for Propagation
Stable parameters speed recovery: temperature near 24-26 degrees Celsius, pH 8.1-8.4, and alkalinity, calcium, and magnesium kept steady so the skeleton can extend. Moderate flow and medium light help the frag heal without irritating the freshly cut tissue.
Sexual Reproduction
Sexual reproduction in Euphyllia occurs on the reef rather than in home aquaria and does not contribute to hobby propagation. Detailed gamete data for E. glabrescens is not documented in the consulted sources, so only asexual fragmentation is used by aquarists.
Common Challenges
Torch corals carry long sweeper tentacles tipped with potent cnidocytes that can sting neighbouring corals, so frags need open space. The freshly cut tissue is also vulnerable to brown jelly, a contagious ciliate infection that can spread between corallites and jump to other Euphyllia within days; affected tissue should be fragged off and discarded.