Why does BioShock Tenuis (Acropora tenuis) shift colors under different lights, and how can I keep its “glow” stable?

Tenuis pigments respond strongly to heavy blue/UV and stable, low-to-moderate nutrients (NO3 ~5–15 ppm, PO4 ~0.03–0.08 ppm). Excess white or sudden PAR jumps can wash out tips; too little nutrients cause pastels and reduced fluorescence. Maintain potassium ~380–420 ppm and trace iron at low, testable levels. Strong, chaotic flow prevents film buildup that dulls tissue. Acclimate to higher PAR over weeks to avoid tip burn and ensure even coloration from base to branches.

What growth form should I expect, and how do I prevent the base from browning out?

Acropora tenuis grows corymbose, forming bushy clumps with thick axial tips. High, cross-directional flow and PAR 250–400 encourage tight, compact branching. As colonies thicken, inner bases can shade and starve. Mount on a low-profile plug or small pedestal, prune interior branches periodically, and keep flow penetrating the colony. Avoid letting encrustment creep into stagnant corners; small “windows” created by selective trimming keep light/flow to the base and preserve color.

How can I spot pests early on this species, and what signs are specific to tenuis?

Tenuis shows early stress at new growth: look for crescent-shaped bite marks or sandpaper patches (AEFW), tiny orange specks at polyp bases (red bugs), or dimmed fluorescence on the brightest tips. Night inspection with blue light and a magnifier reveals pests faster. Dip new pieces (oxidative or iodine-based), then observe on a frag rack for two weeks. If bite marks appear, perform targeted dips and turkey-baste daily; inspect frags’ undersides and axial tips where eggs cluster.

My tenuis receded after a PAR increase and minor alk swing—how do I stop STN/RTN and rebuild color?

Stabilize first: hold alk within 0.2 dKH daily, pause further PAR changes, and restore prior spectrum. Increase aeration and flow, and run fresh carbon to remove irritants. Trim clearly necrotic tips to clean tissue, then iodine dip. Feed small, frequent aminos or fine particulate at lights-out for a week to support recovery. Resume light acclimation via mesh/screens over 2–3 weeks. Verify temperature stability and maintain moderate nutrients to regain fluorescence.

TSA BioShock Tenuis Acropora Coral

Acropora SPS

Overview

BioShock Tenuis Acropora Coral displays branching, tightly spaced axial tips with contrasting polyp coloration. Acropora tenuis is a small-polyp stony branching coral that prefers strong light and high, turbulent water flow. It is primarily photosynthetic via symbiotic algae but can accept fine particulate foods, which may support growth and coloration. Place high on stable rockwork with space from aggressive neighbors, and keep alkalinity and nutrients stable.

Quick Facts

Care Difficult

Lighting High

Flow High, turbulent

Placement High

Temperament Peaceful (2 inches spacing)

Recommended Parameters

Temp 77–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 420–450 ppm

AlkAlkalinity 7.5–9.0 dKH

Magnesium 1280–1350 ppm

Feeding photosynthetic, microzooplankton, rotifers, copepod nauplii, coral-specific powdered foods, amino acid supplements, marine snow

Care & Placement

BioShock Tenuis Acropora Coral (Acropora tenuis) thrives in bright light, strong random flow, and very stable water. Target 250–350 PAR with a gradual light acclimation over 1–2 weeks to prevent bleaching; use a PAR meter if possible. Provide high, turbulent flow to keep tissue clean and avoid detritus, but avoid direct, constant jets. Place frags in the upper third on a secure mount with room for branching; leave 3–4 inches from other corals and keep distance from aggressive LPS sweepers. Feed sparingly 1–3x weekly with fine particulate foods (0.5–200 µm) and occasional amino acids if nutrients are low. Keep temperature 75–79°F (24–26°C), salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH (minimal daily swing), calcium 420–460 ppm, magnesium 1300–1400 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. Test weekly, use an auto top-off, and make small, frequent adjustments.Acclimate new pieces with a drip for 30–60 minutes, then coral dip and inspect for pests (AEFW, red bugs); quarantine if possible. Common issues: bleaching (too much light or near-zero nutrients), slow tissue loss (alk swings, low flow), rapid loss (severe instability or pests). Troubleshoot by restoring stability, improving flow, raising nutrients slightly, iodine dips, and fragging healthy margins if needed. Compatibility is generally good with other SPS; avoid nipping fish (some angels, butterflies) and stinging neighbors. Periodically baste to keep surfaces clean and keep parameters steady for best color and growth.

FAQ

Frequently Asked Questions

About the TSA BioShock Tenuis Acropora Coral

Why does BioShock Tenuis (Acropora tenuis) shift colors under different lights, and how can I keep its “glow” stable?

Tenuis pigments respond strongly to heavy blue/UV and stable, low-to-moderate nutrients (NO3 ~5–15 ppm, PO4 ~0.03–0.08 ppm). Excess white or sudden PAR jumps can wash out tips; too little nutrients cause pastels and reduced fluorescence. Maintain potassium ~380–420 ppm and trace iron at low, testable levels. Strong, chaotic flow prevents film buildup that dulls tissue. Acclimate to higher PAR over weeks to avoid tip burn and ensure even coloration from base to branches.
What growth form should I expect, and how do I prevent the base from browning out?

Acropora tenuis grows corymbose, forming bushy clumps with thick axial tips. High, cross-directional flow and PAR 250–400 encourage tight, compact branching. As colonies thicken, inner bases can shade and starve. Mount on a low-profile plug or small pedestal, prune interior branches periodically, and keep flow penetrating the colony. Avoid letting encrustment creep into stagnant corners; small “windows” created by selective trimming keep light/flow to the base and preserve color.
How can I spot pests early on this species, and what signs are specific to tenuis?

Tenuis shows early stress at new growth: look for crescent-shaped bite marks or sandpaper patches (AEFW), tiny orange specks at polyp bases (red bugs), or dimmed fluorescence on the brightest tips. Night inspection with blue light and a magnifier reveals pests faster. Dip new pieces (oxidative or iodine-based), then observe on a frag rack for two weeks. If bite marks appear, perform targeted dips and turkey-baste daily; inspect frags’ undersides and axial tips where eggs cluster.
My tenuis receded after a PAR increase and minor alk swing—how do I stop STN/RTN and rebuild color?

Stabilize first: hold alk within 0.2 dKH daily, pause further PAR changes, and restore prior spectrum. Increase aeration and flow, and run fresh carbon to remove irritants. Trim clearly necrotic tips to clean tissue, then iodine dip. Feed small, frequent aminos or fine particulate at lights-out for a week to support recovery. Resume light acclimation via mesh/screens over 2–3 weeks. Verify temperature stability and maintain moderate nutrients to regain fluorescence.

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