Why does my Golden Honeycomb Acropora (Acropora tenuis) shift from golden to green or blue under the same lights over time?

Tenuis pigments swing with micro-changes in nutrient balance and UV/blue spectrum emphasis. Golden tones hold best with moderate nutrients (NO3 5–10 ppm, PO4 0.03–0.07), high but stable PAR (280–350), and strong, chaotic flow. Excessive nutrient stripping or sudden UV increases push blues; elevated nutrients and lower PAR push greens/browning. Adjust slowly, and keep alkalinity rock-steady (7.5–8.5 dKH) to maintain pigment stability.

My colony grows a thick base but stalls vertically—normal for this species?

Yes. A. tenuis often prioritizes encrusting to anchor before shooting axial branches. Encourage vertical growth by ensuring high, variable flow across the tips (random gyre pulses), keeping PAR highest at the crown, and avoiding shadowing from neighboring branches. Slightly raising the colony off the rock to improve underside flow helps. Stable calcium (420–460 ppm) and balanced alk uptake prevent tip burn that can pause axial growth.

How can I spot and manage pests specific to Acropora tenuis without nuking the tank?

Watch for tiny bite marks and pale patches between polyps (AEFW) or reduced polyp extension with minute orange “dots” (red bugs). Use a turkey baster to blast the colony; flatworms dislodge as ovals. Employ a removable frag/plug approach: weekly dips (e.g., iodine or specific coral dips) plus interceptor-style treatments in a separate system for red bugs. Add wrasses (e.g., melanurus) as patrol, and inspect new frags under white light before introduction.

Any propagation tips to keep the honeycomb pattern and color after fragging?

Select branches with defined axial tips and visible radial corallites; avoid overly thin, shaded twigs. Make clean cuts with bone cutters, glue to small, open plugs, and cure in high, random flow. Place frags where PAR matches the mother’s tip zone to preserve pigments. Dose low-level amino acids only after polyp extension returns (7–10 days). Keep alk swings under 0.2 dKH/day; sudden rises wash out golds and slow encrustment.

TSA Neon Nectar Acropora Coral

Acropora SPS

Overview

Golden Honeycomb Acropora Coral shows tight, honeycomb-like polyp spacing on golden-tipped branches. Acropora tenuis is a small-polyp stony branching coral that prefers strong light and high, turbulent water flow. It is primarily photosynthetic with symbiotic algae, but occasional tiny planktonic foods can support growth and color. Place high on stable rock with space from aggressive corals, and avoid shading or sudden parameter swings.

Quick Facts

Care Difficult

Lighting High

Flow High

Placement High

Temperament Peaceful (3–4 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 7.5–9 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic (primary), microzooplankton, rotifers, copepod nauplii, oyster eggs, reef roids, reef chili, amino acid supplements, marine snow

Care & Placement

Golden Honeycomb Acropora Coral (Acropora tenuis) thrives under bright light, strong random flow, and very stable water. Target 250–400 PAR with gradual light acclimation using reduced intensity or window screen to avoid bleaching. Provide high, turbulent flow to keep polyps clean and prevent detritus buildup; avoid direct “jet” blasts on the tissue. Primary nutrition comes from light, but 1–3 small feedings per week of fine particle foods or amino acids can support color and growth. Keep temperature 24–26°C (75–79°F), salinity 1.025–1.026 (35 ppt), pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 420–460 ppm, magnesium 1300–1400 ppm, nitrate 2–10 ppm, and phosphate 0.02–0.07 ppm. Test alk daily when new and dose to hold it steady; use auto top-off for salinity and a reliable heater/controller for temp.Place frags high in the tank with room for upward and branching growth; avoid shading from other colonies. Provide several inches of space from aggressive LPS and soft corals with sweepers or chemical defenses. Acropora can sting each other on contact, so avoid touching tips between colonies. Acclimate all pieces with a coral dip and quarantine to screen for pests like flatworms and red bugs. Common issues include pale color from low nutrients, bleaching from rapid light changes, and tissue recession from alk swings or pests. If problems arise, check stability first, increase flow, restore moderate nutrient levels, and trim dead tissue to healthy margins. Handle gently and keep hands off the skeleton to prevent damage.

FAQ

Frequently Asked Questions

About the TSA Neon Nectar Acropora Coral

Why does my Golden Honeycomb Acropora (Acropora tenuis) shift from golden to green or blue under the same lights over time?

Tenuis pigments swing with micro-changes in nutrient balance and UV/blue spectrum emphasis. Golden tones hold best with moderate nutrients (NO3 5–10 ppm, PO4 0.03–0.07), high but stable PAR (280–350), and strong, chaotic flow. Excessive nutrient stripping or sudden UV increases push blues; elevated nutrients and lower PAR push greens/browning. Adjust slowly, and keep alkalinity rock-steady (7.5–8.5 dKH) to maintain pigment stability.
My colony grows a thick base but stalls vertically—normal for this species?

Yes. A. tenuis often prioritizes encrusting to anchor before shooting axial branches. Encourage vertical growth by ensuring high, variable flow across the tips (random gyre pulses), keeping PAR highest at the crown, and avoiding shadowing from neighboring branches. Slightly raising the colony off the rock to improve underside flow helps. Stable calcium (420–460 ppm) and balanced alk uptake prevent tip burn that can pause axial growth.
How can I spot and manage pests specific to Acropora tenuis without nuking the tank?

Watch for tiny bite marks and pale patches between polyps (AEFW) or reduced polyp extension with minute orange “dots” (red bugs). Use a turkey baster to blast the colony; flatworms dislodge as ovals. Employ a removable frag/plug approach: weekly dips (e.g., iodine or specific coral dips) plus interceptor-style treatments in a separate system for red bugs. Add wrasses (e.g., melanurus) as patrol, and inspect new frags under white light before introduction.
Any propagation tips to keep the honeycomb pattern and color after fragging?

Select branches with defined axial tips and visible radial corallites; avoid overly thin, shaded twigs. Make clean cuts with bone cutters, glue to small, open plugs, and cure in high, random flow. Place frags where PAR matches the mother’s tip zone to preserve pigments. Dose low-level amino acids only after polyp extension returns (7–10 days). Keep alk swings under 0.2 dKH/day; sudden rises wash out golds and slow encrustment.