Why does my Fire in the Sky Acropora (Acropora tenuis) lose red and blue contrast under strong light?

Color shifts often reflect nutrient balance and spectrum, not just PAR. Aim for 250–350 PAR with strong blue/UV (400–430 nm) dominance. Keep nitrate 2–10 ppm and phosphate 0.03–0.08 ppm—ultra-low nutrients can wash out reds, while excess can brown the base. Maintain stable alkalinity (8–9 dKH); spikes under high PAR cause tip burn and fading.

How can I promote fuller branching instead of just a wide encrusted base?

Give high, cross-current flow that sweeps around the base to prevent detritus buildup, and avoid shadowing by slightly rotating the frag weekly until vertical branches form. Mount on a small plug or narrow ridge to discourage endless plating. Moderate feeding of fine particulate foods at night can support tissue growth without driving nutrients too high.

My colony has great polyp extension but slow vertical growth—what should I adjust?

Persistent polyp extension with slow height often points to insufficient turbulent flow and mild shading. Increase random flow bursts to 30–50x turnover and reduce neighboring overhangs that cast shadows. Ensure phosphate isn’t bottomed out (<0.01 ppm) and that PAR at the upper branches exceeds 250. Small, regular water changes can replenish trace elements used in calcification.

How do I differentiate pest damage from stress-related recession on A. tenuis?

AEFW leave irregular bite marks and pale patches with fine fecal dust; red bugs reduce polyp extension without obvious bites. Stress recession is smoother and tracks from a cut, base, or tip after parameter swings. Inspect at night with a flashlight, turkey-baste the colony to dislodge flatworms, and dip suspect frags. Quarantine new acros for 4–6 weeks.

TSA Fire in the Sky Tenuis Acropora Coral

Q: How do I differentiate pest damage from stress-related recession on A. tenuis?

AEFW leave irregular bite marks and pale patches with fine fecal dust; red bugs reduce polyp extension without obvious bites. Stress recession is smoother and tracks from a cut, base, or tip after parameter swings. Inspect at night with a flashlight, turkey-baste the colony to dislodge flatworms, and dip suspect frags. Quarantine new acros for 4–6 weeks.

Acropora SPS

Overview

Fire in the Sky Acropora Coral shows branching, tightly spaced branchlets with contrasting tip coloration. Acropora tenuis is a small-polyp stony coral with a branching structure; it prefers strong lighting and high, turbulent water flow. It relies on symbiotic algae for most nutrition but benefits from occasional fine particulate foods, which can support growth and color. Place high on stable rock with ample space from aggressive neighbors, and maintain consistent, low-nutrient, stable water to avoid tissue loss.

Quick Facts

Care Difficult

Lighting High

Flow High, turbulent

Placement High

Temperament Peaceful (2–3 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 7.5–8.5 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic (primary), microplankton, rotifers, copepod nauplii, oyster eggs, reef roids/powdered coral foods, amino acids

Care & Placement

Fire in the Sky Acropora Coral (Acropora tenuis) thrives with high, stable light and strong, random flow. Target 250–400 PAR with gradual light acclimation (use screen layers or reduced intensity for 1–2 weeks) to avoid bleaching. Provide vigorous, alternating flow to keep polyps clean and prevent detritus buildup; avoid direct laminar jets. Place frags in the upper third on a stable mount with room to grow; allow 3–4 inches from neighbors. Keep away from aggressive LPS with long sweepers and from soft corals known for chemical warfare; best companions are other SPS and peaceful fish (avoid nipping angels and butterflies). Maintain temperature 75–79°F (24–26°C), pH 8.1–8.4, salinity 1.025–1.026, alkalinity 8.0–9.5 dKH (very stable), calcium 420–460 ppm, magnesium 1300–1400 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. Test regularly with reliable kits, log trends, and use ICP checks periodically. Feed fine particulate foods or live phyto/rotifers 1–2 times weekly at night; amino acids can improve color if used sparingly and with nutrient control. Drip acclimate and always dip new pieces; inspect for Acropora-eating flatworms and red bugs. Watch for rapid tissue loss from alkalinity swings, low nutrients, pests, or low flow; adjust slowly. Use consistent dosing, auto top-off, and strong export to keep nutrients measurable but not excessive.

FAQ

Frequently Asked Questions

About the TSA Fire in the Sky Tenuis Acropora Coral

Why does my Fire in the Sky Acropora (Acropora tenuis) lose red and blue contrast under strong light?

Color shifts often reflect nutrient balance and spectrum, not just PAR. Aim for 250–350 PAR with strong blue/UV (400–430 nm) dominance. Keep nitrate 2–10 ppm and phosphate 0.03–0.08 ppm—ultra-low nutrients can wash out reds, while excess can brown the base. Maintain stable alkalinity (8–9 dKH); spikes under high PAR cause tip burn and fading.
How can I promote fuller branching instead of just a wide encrusted base?

Give high, cross-current flow that sweeps around the base to prevent detritus buildup, and avoid shadowing by slightly rotating the frag weekly until vertical branches form. Mount on a small plug or narrow ridge to discourage endless plating. Moderate feeding of fine particulate foods at night can support tissue growth without driving nutrients too high.
My colony has great polyp extension but slow vertical growth—what should I adjust?

Persistent polyp extension with slow height often points to insufficient turbulent flow and mild shading. Increase random flow bursts to 30–50x turnover and reduce neighboring overhangs that cast shadows. Ensure phosphate isn’t bottomed out (<0.01 ppm) and that PAR at the upper branches exceeds 250. Small, regular water changes can replenish trace elements used in calcification.
How do I differentiate pest damage from stress-related recession on A. tenuis?

AEFW leave irregular bite marks and pale patches with fine fecal dust; red bugs reduce polyp extension without obvious bites. Stress recession is smoother and tracks from a cut, base, or tip after parameter swings. Inspect at night with a flashlight, turkey-baste the colony to dislodge flatworms, and dip suspect frags. Quarantine new acros for 4–6 weeks.