Euphyllia cristata (Grape Coral) Propagation Guide

Propagating Euphyllia cristata, the grape coral: a phaceloid Euphyllia with small clustered polyps, fragged by cutting between heads, with sweeper-tentacle and brown-jelly cautions.

Overview

Euphyllia cristata, the grape coral, is a less common large-polyped stony coral in the family Euphylliidae. It grows as a phaceloid colony with long tubular tentacles tipped with knob-like ends, but its skeleton is short, thin, and fragile, sitting close to the substrate. Reef Builders notes that colonies of more than four or five polyps are very unusual, and that in nature it lives under bommies below other corals.

Reproductive Mode

Propagation in the aquarium is asexual, by dividing the phaceloid skeleton between polyp heads, the same principle used for other branching Euphyllia. Because E. cristata grows slowly and naturally stays small, frags are taken sparingly and given time to recover.

Fragging / Asexual Propagation

1. Wait until a colony carries several heads, which can take time given its slow growth.
2. Cut through the thin skeleton between heads with coral cutters; handle gently because the skeleton is fragile and breaks easily.
3. Keep cuts on the bare skeleton rather than through polyp flesh.
4. Dip the frags to remove pests before mounting.
5. Glue each frag to a plug in low flow and medium light, and feed lightly to support recovery.

Reef Builders suggests that with more attention to feeding in captivity, this normally slow species could grow faster than it does in its shaded natural habitat.

Conditions for Propagation

Maintain temperature near 24-26 degrees Celsius and pH 8.1-8.4 with steady alkalinity, calcium, and magnesium. Medium light and moderate flow suit recovery; a couple of feedings a week reflect its cryptic, food-reliant reef niche.

Sexual Reproduction

Sexual reproduction occurs on the reef and is not used by aquarists. Notably, E. cristata was excluded from the genetic studies that moved several relatives into the genus Fimbriaphyllia, and it shares skeletal traits with E. glabrescens. Captive spawning is not documented in the consulted sources.

Common Challenges

As a Euphyllia, grape coral can extend stinging tentacles, so frags should be given space from other corals. The thin, fragile skeleton makes clean fragging harder, and freshly cut Euphyllia tissue is vulnerable to brown jelly, which spreads quickly between corallites.