Frogspawn Coral

Frogspawn Coral key facts

Care level

Intermediate

Temperature

24〜27℃

Diet

Photosynthesis via zooxanthellae, supplemented with zooplankton

Lighting

Low to moderate lighting suits it. Strong light causes fading, so provide steady moderate LED lighting.

Flow

Low–moderate; adjust so tentacles flow

Water Quality

KH 7-9, Ca 400-450ppm, keep stable

Diet & Feeding

In addition to photosynthesis by its zooxanthellae, feeding zooplankton 1-2 times a week promotes colour and growth.

Health & Cautions

It can be propagated by fragging, splitting the skeleton. If the tentacles stay retracted, check whether flow or light is too strong.

Notes

Long sweeper tentacles attack neighbors; give wide spacing

About Frogspawn Coral

Frogspawn Coral (Euphyllia paradivisa) is a large polyp stony (LPS) coral found on reef slopes across the Indo-Pacific. Bulb-tipped tentacles extend from a branching skeleton, resembling a mass of frog eggs, which gives the coral its common name. Color morphs include green, gold, and purple, and the tentacles swaying in the flow are its main appeal. However, its long sweeper tentacles strongly attack neighboring corals, so ample spacing is essential in a reef layout. With low to moderate lighting, gentle flow, and stable water quality, it is relatively easy to keep and is popular as an LPS coral for beginner to intermediate hobbyists.

7 things to know before welcoming a Frogspawn Coral

1. 1Water Stability Comes First

   Frogspawn Coral is sensitive to sudden swings in alkalinity (dKH), calcium, and magnesium. Aim for 7–9 dKH and 400–450 mg/L calcium, and test at least once a week. Avoid rapid corrections, as abrupt changes can cause tissue recession.

2. 2Gentle to Moderate Flow Is Ideal

   A gentle to moderate, indirect flow that makes the tentacles sway naturally is ideal. Direct, high-velocity flow can damage the tentacles and cause polyps to remain retracted. Position powerheads to create turbulent, indirect circulation rather than a direct blast.

3. 3Low to Moderate Light

   Frogspawn Coral prefers low to moderate light rather than intense illumination. Steady, moderate LED lighting works well, and acclimating it to lower light first reduces stress. While it relies on zooxanthellae for nutrition, excessive light can cause the color to fade.

4. 4Aggression Toward Neighbors

   Frogspawn Coral extends long sweeper tentacles that can strongly sting and damage neighboring corals. Leave generous space between it and other corals. Even other Euphyllia species such as Hammer or Torch should not be allowed to make contact, as stinging can cause tissue damage.

5. 5Target Feeding Boosts Growth

   While it can survive on photosynthesis alone, target feeding with zooplankton such as copepods, or coral-specific foods, once or twice a week promotes color and growth. Turn off flow briefly during feeding and deliver food directly to open polyps for best results.

6. 6Watch for Brown Jelly Disease

   Euphyllia corals can suffer from brown jelly disease, a rapid tissue breakdown that produces brown, mucus-like material. If you notice it on the coral, remove it with a syringe and isolate the colony immediately. Poor water quality and physical damage are common triggers.

7. 7What to Check Before You Buy

   This species is popular, and frags vary in size and coloration. Prices differ from listing to listing depending on lineage, color, size, and the individual, so check each listing page. Keeping it well requires stable lighting, water flow, and water-quality equipment, and it helps to have dosing additives and salt mix ready in advance. Setting up a well-cycled tank carefully from the start supports stable long-term keeping.

Frequently asked questions about Frogspawn Coral

Q.What tank size is needed for Frogspawn Coral?

A.A tank of at least 60 cm (approximately 57 liters) is recommended. Larger water volume helps maintain stable parameters, which directly benefits coral health. Nano reef setups are possible but require more diligent monitoring.

Q.Why do the polyps stay retracted all the time?

A.Common causes include poor water quality, excessive direct flow, overly intense lighting, and physical stress. Start by checking alkalinity, ammonia, and nitrite levels, and verify that flow is not hitting the coral directly. Acclimation to a new environment can also take several days to a week.

Q.Can Frogspawn Coral be kept with other corals?

A.Yes, but adequate spacing is essential to prevent sweeper tentacle contact. It can sting both hard and soft corals placed too close. Even other Euphyllia species such as Hammer or Torch should not be allowed to touch, as chemical and physical contact causes tissue damage.

Q.Does Frogspawn Coral propagate or split?

A.Healthy colonies gradually branch out and grow over time. Propagation by fragging, which divides the skeleton, is also possible, but cut surfaces are susceptible to brown jelly disease, so use clean tools and allow frags to recover in a separate, stable environment.

Q.My Frogspawn Coral is turning brown—is that normal?

A.Browning is often caused by an increase in zooxanthellae density, commonly linked to excessive nutrients or overly intense light. While not immediately harmful, adjusting lighting intensity and nutrient levels can help restore vibrant coloration. Note that this differs from brown jelly disease, which involves visible mucus and rapid tissue loss.

Useful tools for Frogspawn Coral care

Learn more about Frogspawn Coral in the encyclopedia

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