Why is the base of my Green Branching Cyphastrea receding while the branch tips look fine?

Cyphastrea decadia can self-shade as branches thicken, starving the base of light and flow. Increase oblique flow to clear detritus, rotate or lower the colony so indirect light reaches the base, and trim or frag dense clusters. Keep alkalinity stable and nutrients non-zero (e.g., nitrate 5–15 ppm, phosphate 0.03–0.1 ppm) to prevent slow tissue necrosis at shaded margins.

What lighting strategy keeps the vivid green without causing paling?

Acclimate slowly to low–moderate PAR (60–120) with a blue-biased spectrum to preserve fluorescence. High whites can wash the green and cause tip paling, especially after a rapid jump in intensity. Extend the photoperiod instead of spiking PAR, and watch for tighter polyp extension or a matte look—early signs it’s getting too much light. Adjust in 10–15% steps weekly.

How can I feed this coral effectively if its polyps open mostly at night?

Target feed after lights out when polyps extend: rotifers, nauplii, or finely milled reef foods suspended in the flow. A gentle broadcast with pumps pulsed down for 5–10 minutes improves capture. Two to three small sessions weekly is plenty. Amino acids can help in low light, but reduce dosing if film algae increases or polyp extension decreases.

Are there specific pests or irritants that this species is sensitive to on its branches?

Vermetid snails and hydroids can irritate tissue on branch junctions with mucous nets or stings, leading to localized recession. Manually remove vermetids and cap tubes with gel glue. Maintain enough crossflow to keep detritus from collecting in crotches. If irritation persists, inspect for flatworms at night and dip; Cyphastrea responds well to standard coral dips when promptly treated.

Green Branching Cyphastrea Coral

SPS

Overview

Green Branching Cyphastrea Coral has short, knobby branches covered in small star-shaped polyps. Cyphastrea decadia is a small-polyp stony coral with a branching base that prefers low to moderate light and gentle to moderate water flow. It hosts symbiotic algae for most of its energy, but occasional small-particle feedings can support faster growth and maintain color. Place it lower on the rockwork and away from aggressive neighbors, and acclimate slowly to brighter conditions.

Quick Facts

Care Easy

Lighting Low–Moderate

Flow Low–Moderate

Placement Low–Mid

Temperament Peaceful to semi-aggressive (2–3 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–450 ppm

AlkAlkalinity 8–9.5 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic (primary), microplankton, rotifers, copepod nauplii, baby brine shrimp, cyclops, oyster eggs, coral-specific powdered foods (e.g., Reef-Roids)

Care & Placement

Green Branching Cyphastrea Coral (Cyphastrea decadia) thrives under low to moderate light (target 50–120 PAR) and gentle, varied flow that prevents detritus from settling on branches while keeping polyps extended. Start it low and shaded, then slowly move to a low–mid position if color holds; sudden light increases can bleach. Feed small-particle foods (rotifers, cyclops, reef nutrition powders) 1–3 times weekly, ideally after lights out when polyps are open; broadcast feeding works, with occasional spot feeding for growth. Maintain stable parameters: temperature 75–79°F (24–26°C), salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 5–15 ppm, phosphate 0.03–0.10 ppm. Monitor with reliable test kits and a PAR meter if possible; this species is sensitive to alkalinity swings and rapid lighting changes. Place on rockwork where branches won’t trap debris; use epoxy or glue for secure mounting. Provide 2–3 inches of space from aggressive neighbors (sweeper-tentacle LPS, some chalices) to avoid stings; generally peaceful with other small-polyp stony corals. Acclimate by dipping, matching temperature and salinity, and light-acclimating over 1–2 weeks. Common issues: bleaching (too much light), tissue recession (excess flow on tissue or unstable alkalinity), browning (insufficient light or elevated nutrients). Address by adjusting PAR/flow, restoring stability, and improving export if nutrients creep up. Regular observation and gentle turkey-baster blasts help keep the coral clean and healthy.

FAQ

Frequently Asked Questions

About the Green Branching Cyphastrea Coral

Why is the base of my Green Branching Cyphastrea receding while the branch tips look fine?

Cyphastrea decadia can self-shade as branches thicken, starving the base of light and flow. Increase oblique flow to clear detritus, rotate or lower the colony so indirect light reaches the base, and trim or frag dense clusters. Keep alkalinity stable and nutrients non-zero (e.g., nitrate 5–15 ppm, phosphate 0.03–0.1 ppm) to prevent slow tissue necrosis at shaded margins.
What lighting strategy keeps the vivid green without causing paling?

Acclimate slowly to low–moderate PAR (60–120) with a blue-biased spectrum to preserve fluorescence. High whites can wash the green and cause tip paling, especially after a rapid jump in intensity. Extend the photoperiod instead of spiking PAR, and watch for tighter polyp extension or a matte look—early signs it’s getting too much light. Adjust in 10–15% steps weekly.
How can I feed this coral effectively if its polyps open mostly at night?

Target feed after lights out when polyps extend: rotifers, nauplii, or finely milled reef foods suspended in the flow. A gentle broadcast with pumps pulsed down for 5–10 minutes improves capture. Two to three small sessions weekly is plenty. Amino acids can help in low light, but reduce dosing if film algae increases or polyp extension decreases.
Are there specific pests or irritants that this species is sensitive to on its branches?

Vermetid snails and hydroids can irritate tissue on branch junctions with mucous nets or stings, leading to localized recession. Manually remove vermetids and cap tubes with gel glue. Maintain enough crossflow to keep detritus from collecting in crotches. If irritation persists, inspect for flatworms at night and dip; Cyphastrea responds well to standard coral dips when promptly treated.