Why does my Angry Birds Acropora show amazing color on the tips but a dull or receding base?

Tenuis colonies self-shade as branches thicken, starving the base of light and flow. Prune inner branches to open channels, aim alternating, high-energy flow across the base, and avoid laminar jets. Keep PAR 250–350 at tips and 100–150 at the base. Maintain stable alkalinity; sudden spikes under high PAR often trigger tip burn while the shaded base slowly declines.

How do I keep the red body and blue/yellow highlights from fading on this morph?

Color shifts with spectrum and nutrients. Use strong blue-heavy light (peaks around 420–450 nm) and avoid an ultra-lean system—keep detectable nitrate (5–15 ppm) and phosphate (0.03–0.08 ppm). Too clean washes colors; too rich browns them. Amino dosing can help if nutrients are low. Increase intensity slowly; rapid jumps bleach the reds first.

I’m seeing polyp extension at night but not much by day—should I worry?

Tenuis often shows stronger nocturnal extension, especially under high flow and bright light. Look for consistent nighttime extension and new axial growth as better health signs than daytime fluff. If both day and night extension decline, check for AEFW bite marks, red bugs, or alk instability. A brief blue-only period at the end of the photoperiod can encourage feeding.

How can I prevent sudden tissue loss (STN/RTN) episodes in this species?

Stability is key. Keep dKH within a tight window and avoid rapid boosts after consumption spikes. Ensure vigorous, randomized flow to clear mucus and detritus. Run fresh carbon when adding aggressive neighbors to limit chemical stress. Quarantine for AEFW and red bugs, and dip at the first sign of bite tracks. If necrosis starts, frag ahead of the lesion promptly.

Reef Raft USA Angry Birds Acropora Coral

Acropora

Overview

Angry Birds Acropora Coral shows vivid contrasting branch tips with tightly spaced corallites. Acropora tenuis is a branching small-polyp stony coral that prefers strong light and high, turbulent water flow. It is primarily photosynthetic via symbiotic algae, but occasional small-particle foods can support growth and color. Place high on stable rock with ample space from aggressive neighbors, and keep alkalinity stable with low nutrients to prevent tissue loss.

Quick Facts

Care Difficult

Lighting High

Flow High

Placement High

Temperament Semi-aggressive (2–4 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 8–9 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic, microplankton, rotifers, copepod nauplii, oyster eggs, reef roids, amino acids, marine snow

Care & Placement

Angry Birds Acropora Coral (Acropora tenuis) thrives with strong, stable conditions and high light. Target 250–350 PAR under quality LEDs, T5s, or halides; acclimate to light over 1–2 weeks by starting lower or using screens to avoid bleaching. Provide strong, random flow to keep polyps clean and deter detritus buildup; aim for alternating patterns from multiple pumps. Keep temperature 75–79°F (24–26°C), salinity 1.025–1.026, 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. This species is sensitive to swings—test regularly and adjust slowly. Feed fine particulate foods (reef roids, rotifers) or amino acids 1–2x weekly at night for better color and growth, but avoid nutrient spikes; strong export and skimming help.Place high in the tank on a stable rock with room to grow upward and outward; allow 3–4 inches from neighbors to prevent shading and stings. Keep away from aggressive LPS and soft corals with long sweepers; Acropora can be outcompeted by allelopathic species. Dip and quarantine to prevent Acropora-eating flatworms and red bugs. Watch for tissue recession (often from alkalinity swings, pests, or low flow) and pale tips (too much light or low nutrients). If stressed, lower light intensity, increase varied flow, verify alkalinity stability, and perform small water changes. Encourage encrustment before strong vertical growth; frag cleanly if needed and maintain stable parameters for recovery.

FAQ

Frequently Asked Questions

About the Reef Raft USA Angry Birds Acropora Coral

Why does my Angry Birds Acropora show amazing color on the tips but a dull or receding base?

Tenuis colonies self-shade as branches thicken, starving the base of light and flow. Prune inner branches to open channels, aim alternating, high-energy flow across the base, and avoid laminar jets. Keep PAR 250–350 at tips and 100–150 at the base. Maintain stable alkalinity; sudden spikes under high PAR often trigger tip burn while the shaded base slowly declines.
How do I keep the red body and blue/yellow highlights from fading on this morph?

Color shifts with spectrum and nutrients. Use strong blue-heavy light (peaks around 420–450 nm) and avoid an ultra-lean system—keep detectable nitrate (5–15 ppm) and phosphate (0.03–0.08 ppm). Too clean washes colors; too rich browns them. Amino dosing can help if nutrients are low. Increase intensity slowly; rapid jumps bleach the reds first.
I’m seeing polyp extension at night but not much by day—should I worry?

Tenuis often shows stronger nocturnal extension, especially under high flow and bright light. Look for consistent nighttime extension and new axial growth as better health signs than daytime fluff. If both day and night extension decline, check for AEFW bite marks, red bugs, or alk instability. A brief blue-only period at the end of the photoperiod can encourage feeding.
How can I prevent sudden tissue loss (STN/RTN) episodes in this species?

Stability is key. Keep dKH within a tight window and avoid rapid boosts after consumption spikes. Ensure vigorous, randomized flow to clear mucus and detritus. Run fresh carbon when adding aggressive neighbors to limit chemical stress. Quarantine for AEFW and red bugs, and dip at the first sign of bite tracks. If necrosis starts, frag ahead of the lesion promptly.