Why does my Circus Freak Tenuis (Acropora tenuis) look muted under high PAR but pop under blues?

This morph often shows strongest fluorescence under 420–470 nm, while excessive white/UV or very high PAR can wash pigments and cause tip burn. Aim for 250–350 PAR with a blue-heavy spectrum, ramping slowly. Keep nutrients non-zero (NO3 5–15 ppm, PO4 0.03–0.08 ppm) to avoid pastel fade. Stable alkalinity (7.5–8.5 dKH) prevents oxidative stress that dulls colors.

It encrusts fast but stalls on vertical branching—how can I jump-start upward growth?

Mount the frag at a slight angle so light hits one side of the axial corallite, promoting an apical branch. Maintain turbulent, cross-directional flow over the tip; avoid laminar blasts. Keep the base clear of shadowing to prevent basal recession. Minor weekly micro-trims of competing branches can redirect energy to a desired leader.

I’m seeing tiny bite marks and reduced polyp extension—could this be pests specific to tenuis?

Tenuis is a favorite target of Acropora-eating flatworms and red bugs. Look for crescent bites, pale patches, and egg clusters along branch undersides. Do a nighttime inspection with a flashlight. Perform matched-temperature dips (e.g., Bayer/iodine per vetted protocols), turkey-baste to dislodge pests, and repeat on a 6–7 day cycle. Quarantine new acros; use a wrasse helper only as secondary control.

My colony browns at the base while tips stay colored—what’s the advanced fix?

This often reflects detritus accumulation and localized low flow causing microbial stress. Increase chaotic flow at the base, raise the colony sli

TSA Circus Freak Tenuis Acropora Coral

Acropora SPS

Overview

Circus Freak Tenuis Acropora Coral shows tightly spaced, branching axial tips with vivid contrasting polyps. Acropora tenuis is a small-polyp stony branching coral that 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 rockwork with space from aggressive neighbors, and keep parameters stable to prevent tissue recession.

Quick Facts

Care Difficult

Lighting High

Flow High, turbulent

Placement High

Temperament Semi-aggressive (2–3 inches spacing)

Recommended Parameters

Temp 77–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 7.5–9 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic (primary), microplankton, phytoplankton, zooplankton, rotifers, copepod nauplii, coral-specific microfoods (e.g., Reef-Roids)

Care & Placement

Circus Freak Tenuis Acropora Coral (Acropora tenuis) thrives under bright, stable conditions with strong, random water movement. Target 250–350 PAR from full-spectrum LEDs or T5/LED hybrids; acclimate to light by starting lower or reducing intensity for 1–2 weeks to avoid bleaching. Provide high, turbulent flow to keep polyps clean and prevent detritus buildup at the base; aim flow across, not directly at, the colony. Maintain temperature 24–26°C (75–79°F), salinity 1.025–1.026, pH 8.0–8.4, calcium 420–460 ppm, alkalinity 7.5–9.0 dKH, magnesium 1300–1400 ppm, nitrate 2–10 ppm, and phosphate 0.02–0.07 ppm. Stability is key—avoid rapid nutrient or alkalinity swings. Feed small-particle foods (reef roids, rotifers) or amino acids 1–2x weekly for color and growth; do not overfeed.Place high on the rockwork with strong flow and at least 2–3 inches of space from other SPS; keep well away from LPS with long sweepers. Acropora can irritate neighbors on contact but are easily damaged by chemical warfare from soft corals; use carbon and good export if mixed reefs. Dip and quarantine to exclude pests (AEFW, red bugs). Watch for tissue recession at the base (often low flow or unstable alk) and sudden RTN/STN after big parameter changes. Use reliable test kits, log results weekly, and consider occasional ICP testing. Avoid sudden light changes, aggressive GFO use, or large water chemistry corrections. Fish that nip (some angels, butterflies) may pick at polyps; wrasses are helpful for pest control.

FAQ

Frequently Asked Questions

About the TSA Circus Freak Tenuis Acropora Coral

Why does my Circus Freak Tenuis (Acropora tenuis) look muted under high PAR but pop under blues?

This morph often shows strongest fluorescence under 420–470 nm, while excessive white/UV or very high PAR can wash pigments and cause tip burn. Aim for 250–350 PAR with a blue-heavy spectrum, ramping slowly. Keep nutrients non-zero (NO3 5–15 ppm, PO4 0.03–0.08 ppm) to avoid pastel fade. Stable alkalinity (7.5–8.5 dKH) prevents oxidative stress that dulls colors.
It encrusts fast but stalls on vertical branching—how can I jump-start upward growth?

Mount the frag at a slight angle so light hits one side of the axial corallite, promoting an apical branch. Maintain turbulent, cross-directional flow over the tip; avoid laminar blasts. Keep the base clear of shadowing to prevent basal recession. Minor weekly micro-trims of competing branches can redirect energy to a desired leader.
I’m seeing tiny bite marks and reduced polyp extension—could this be pests specific to tenuis?

Tenuis is a favorite target of Acropora-eating flatworms and red bugs. Look for crescent bites, pale patches, and egg clusters along branch undersides. Do a nighttime inspection with a flashlight. Perform matched-temperature dips (e.g., Bayer/iodine per vetted protocols), turkey-baste to dislodge pests, and repeat on a 6–7 day cycle. Quarantine new acros; use a wrasse helper only as secondary control.
My colony browns at the base while tips stay colored—what’s the advanced fix?

This often reflects detritus accumulation and localized low flow causing microbial stress. Increase chaotic flow at the base, raise the colony sli

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