Why do some Evergreen Duncan Coral colonies grow tall, branching stalks while others form low, spreading clusters?

Morphology reflects conditions. Moderate, oscillating flow and slightly higher PAR (120–150) encourage branching; lower PAR (70–100) and gentler flow favor compact, plating clusters. Regular feeding pushes faster basal budding. Give heads room—crowding drives vertical growth. Mounting at a slight angle promotes outward sprouting rather than stacking. Stability in alkalinity and nutrients prevents “stretching” caused by chasing light/flow.

My “evergreen” centers are dulling—how can I restore the vivid green without bleaching?

Emphasize blue spectrum (420–470 nm) and keep PAR roughly 80–150 at the polyp. Maintain nutrients: nitrate 5–15 ppm, phosphate 0.03–0.10 ppm; ultra‑low nutrients mute fluorescence. Avoid big swings in alkalinity. Activated carbon reduces tint from soft coral allelopathy that can wash color. Trace dosing (e.g., iron/iodine) can help in some tanks but test first—overdosing quickly backfires.

What’s causing prolonged retraction despite “good” water tests?

Look for local irritants: vermetid snail webs beneath skirts, stinging from nearby LPS, or leather coral chemicals. Clip or glue vermetids shut, increase random flow, and run fresh carbon. Verify stability, not just numbers—aim for steady alk 8–9 dKH, Mg ~1300–1400 ppm. Check nighttime pH dips and temperature swings. If one head stays retracted, inspect for tissue nicks or algae on exposed skeleton.

How should I handle sudden tissue melt that looks like brown jelly on a few heads?

Act fast: stop flow, gently siphon the slime, then perform a Lugol’s/iodine dip. Cut away affected heads 5–10 mm into clean skeleton with bone cutters or a saw. Restore flow and replace carbon. Improve oxygenation and avoid heavy feeding for several days. This often follows shipping stress or alkalinity swings, so tighten parameter stability after the intervention.

TSA Evergreen Duncan Coral

Beginner Corals LPS Duncan

Overview

Evergreen Duncan Coral shows large, fleshy polyps with bright green centers and long tentacles. Duncanopsammia axifuga is a stony, branching LPS coral that prefers moderate lighting and gentle to moderate water flow. It hosts symbiotic algae for primary nutrition but accepts small meaty foods, which can speed growth and deepen coloration. Place on stable rockwork with space for expansion, and keep tentacle sweep clear of delicate neighbors.

Quick Facts

Care Easy

Lighting Low–Moderate

Flow Moderate, indirect

Placement Low–Mid

Temperament Peaceful (3–6 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–450 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic (primary), mysis shrimp, enriched brine shrimp, finely chopped krill or shrimp, zooplankton, microplankton, coral-specific powdered foods, LPS pellets

Care & Placement

Evergreen Duncan Coral (Duncanopsammia axifuga) thrives in stable, nutrient-balanced systems with moderate light and gentle, indirect flow. Target 80–150 PAR; too much light can cause bleaching, while too little slows growth and dulls color. Provide random, low–moderate flow to keep polyps swaying and prevent detritus from settling without blasting the tissue. Feed 2–4 times weekly with small meaty foods (mysis, enriched brine, chopped krill) or fine coral foods; feeding boosts polyp growth and budding. Maintain temperature 24–26°C (75–79°F), salinity 1.025 (34–35 ppt), pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. Monitor with reliable test kits and avoid rapid alkalinity shifts, a common trigger for recession.Place low to mid in the tank on a stable rock ledge or sandbed-mounted frag plug, shaded from direct pump output. Allow 2–3 inches of space; Duncans are generally peaceful with short sweepers but can be stung by aggressive neighbors (e.g., some torches, favias). Acclimate by temperature equalizing and a 30–60 minute drip, then light-acclimate using a screen or reduced intensity for a week. Watch for signs: closed polyps or receding tissue suggest excess light/flow or unstable parameters; pale tissue points to low nutrients, while brown jelly after damage needs prompt siphoning and an iodine dip. Keep nutrients measurable, inspect for vermetid snails irritating the flesh, and secure the base so new heads have room to grow.

FAQ

Frequently Asked Questions

About the TSA Evergreen Duncan Coral

Why do some Evergreen Duncan Coral colonies grow tall, branching stalks while others form low, spreading clusters?

Morphology reflects conditions. Moderate, oscillating flow and slightly higher PAR (120–150) encourage branching; lower PAR (70–100) and gentler flow favor compact, plating clusters. Regular feeding pushes faster basal budding. Give heads room—crowding drives vertical growth. Mounting at a slight angle promotes outward sprouting rather than stacking. Stability in alkalinity and nutrients prevents “stretching” caused by chasing light/flow.
My “evergreen” centers are dulling—how can I restore the vivid green without bleaching?

Emphasize blue spectrum (420–470 nm) and keep PAR roughly 80–150 at the polyp. Maintain nutrients: nitrate 5–15 ppm, phosphate 0.03–0.10 ppm; ultra‑low nutrients mute fluorescence. Avoid big swings in alkalinity. Activated carbon reduces tint from soft coral allelopathy that can wash color. Trace dosing (e.g., iron/iodine) can help in some tanks but test first—overdosing quickly backfires.
What’s causing prolonged retraction despite “good” water tests?

Look for local irritants: vermetid snail webs beneath skirts, stinging from nearby LPS, or leather coral chemicals. Clip or glue vermetids shut, increase random flow, and run fresh carbon. Verify stability, not just numbers—aim for steady alk 8–9 dKH, Mg ~1300–1400 ppm. Check nighttime pH dips and temperature swings. If one head stays retracted, inspect for tissue nicks or algae on exposed skeleton.
How should I handle sudden tissue melt that looks like brown jelly on a few heads?

Act fast: stop flow, gently siphon the slime, then perform a Lugol’s/iodine dip. Cut away affected heads 5–10 mm into clean skeleton with bone cutters or a saw. Restore flow and replace carbon. Improve oxygenation and avoid heavy feeding for several days. This often follows shipping stress or alkalinity swings, so tighten parameter stability after the intervention.

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