Duncan Coral, scientifically known as Duncanopsammia axifuga, is a popular large-polyp stony (LPS) coral known for its long, flowing tentacles and bright green or purple centers. Each head (polyp) sits on a branching skeleton, giving it a flower-like appearance when fully extended.

Duncans are especially loved because they combine eye-catching movement with relatively easy care, making them a great choice for both beginners and experienced reef keepers.

Small duncan

$60.00

Quantity

Lighting

Low to moderate lighting

Can adapt to higher light if acclimated slowly

Too much light may cause retraction

Water Flow

Moderate, indirect flow

Enough to gently move the tentacles, but not whip them around

Placement

Middle to lower areas of the tank

Can be placed on rockwork or sand if stable

Leave space for growth and tentacle extension

Water Parameters

Temperature: 76–80°F

Salinity: 1.024–1.026

pH: 8.1–8.4

Alkalinity: 8–12 dKH

Calcium: 400–450 ppm

Magnesium: 1250–1350 ppm

Stable parameters are key for steady growth

Feeding

Photosynthetic but benefits greatly from feeding

Will readily accept:

Mysis shrimp

Brine shrimp

Reef pellets or frozen blends

Feeding 1–2 times per week can increase growth and polyp production

Behavior & Compatibility

Peaceful and reef-safe

Has short sweeper tentacles, so it’s less aggressive than many LPS corals

Can usually be placed closer to other non-aggressive corals, but still allow some space

Growth & Propagation

Fast-growing under good conditions

New heads bud from the base of existing polyps

Can be fragged by cutting between branches of the skeleton

Important Notes

Very hardy, but still sensitive to sudden parameter swings

Polyps retract when stressed—this is an early warning sign

Avoid placing in overly strong flow or direct blast from pumps

Small duncan

Care instructions