Frogspawn Coral (Euphyllia divisa)

Taxonomy & Identity

Frogspawn Coral earns its name from tentacle tips that resemble clusters of frog eggs. This distinctive appearance sets it apart from its Euphyllia relatives. Known for being one of the hardier Euphyllia species, Frogspawn is often recommended as a good starting point for hobbyists new to LPS corals.

Natural Habitat & Distribution

E. divisa ranges across the Indo-Pacific from the Red Sea to Fiji and Tonga. It inhabits reef slopes, back reef areas, and lagoons at depths of 2 to 40 meters. Typically found in areas with moderate light and gentle to moderate current, often alongside other Euphyllia species in mixed coral communities.

Morphology & Growth Forms

Frogspawn grows as branching colonies with corallites at branch tips. Tentacles are tubular with multiple branching tips that create the characteristic "frog egg" appearance. When fully extended, the coral presents a fluffy, cloud-like mass. Colors range from green and brown to pink, purple, and gold, often with contrasting tips.

Lighting Requirements & Spectrum

• Intensity: Low to moderate
• Target PAR: 50–150

Frogspawn is adaptable and tolerates a wider lighting range than some Euphyllia. It does well in moderate light and can adapt to higher intensities if acclimated slowly. Lower placement in the tank is generally recommended. Blue spectrum lighting enhances the fluorescent qualities present in many color morphs.

Flow Requirements & Patterns

• Intensity: Low to moderate
• Type: Indirect, gentle

Like other Euphyllia, Frogspawn prefers gentle flow that allows polyps to extend and sway without being damaged. Excessive flow causes retraction and can lead to tissue damage. Indirect flow from multiple sources creates the best environment for full polyp extension.

Nutrient Dynamics & Water Chemistry

Frogspawn is somewhat more forgiving of parameter fluctuations than other Euphyllia but still benefits from stability. Moderate nutrient levels support health and coloration. Avoid dramatic swings in alkalinity which can cause stress and tissue loss.

Feeding Biology & Symbiosis

Frogspawn hosts zooxanthellae and photosynthesizes effectively but also readily captures food from the water column. The branching tentacle tips are efficient at trapping particles and prey items.

• Mysis and brine shrimp
• Coral-specific foods and powders
• Amino acid supplements
• Small meaty foods placed on tentacles

Regular feeding promotes faster growth and more vibrant coloration. Frogspawn responds well to broadcast feeding and target feeding alike.

Common Diseases, Pests & Predators

• Euphyllia Eating Flatworms – check carefully and dip preventatively
• Brown Jelly Disease – bacterial infection requiring immediate action
• Tissue recession from parameter instability
• Predation by certain fish species (butterflyfish, some angelfish)

Frogspawn tends to be more resilient than Torch corals but still requires quarantine and inspection. Early detection of flatworms is critical to prevent colony loss.

Compatibility & Placement

Frogspawn deploys sweeper tentacles at night and will sting neighboring corals. However, it is generally considered less aggressive than Torch Coral. It typically coexists well with other Euphyllia species when given adequate space.

• Best zone: Lower to middle tank on stable substrate
• Give space: 4–6 inches from non-Euphyllia corals
• Compatible: Other Euphyllia, with appropriate spacing

Fragging Techniques

Frogspawn frags well due to its branching growth form. Use band saws or bone cutters to separate branches, ensuring each frag has at least one complete head with adequate skeleton. Frags typically heal quickly and adapt well to new conditions. Allow healing time before permanent placement.

Aquacultured Strains & Trade Names

Numerous color morphs exist including "Toxic Green" with intense fluorescence, "Gold Frogspawn" featuring yellow-gold coloration, "Purple Tip" with contrasting tip colors, and various "Octospawn" varieties (E. divisa x E. ancora hybrids or similar appearing variants). Australian varieties are highly prized.

Difficulty Rating & Summary

Difficulty: Beginner

Frogspawn is often considered the most forgiving Euphyllia species, making it an excellent choice for reef beginners. Its unique appearance, reasonable hardiness, and beautiful colors have made it a staple in the hobby. With basic care and stable conditions, Frogspawn colonies can grow impressively and provide years of enjoyment.