Why did my bright metallic green centers fade to dull green or brown?

This coral’s color shifts with spectrum and nutrient balance. Excess white light and high phosphate can deepen zooxanthellae, muting fluorescence. Increase blue/UV channels, keep NO3 ~5–15 ppm and PO4 ~0.03–0.1 ppm, and avoid rapid swings in alkalinity. Strong, randomized flow helps keep the mat clean so tissue reflects light better. Expect gradual recovery over 1–3 weeks.

How do I prevent Pachyclavularia violacea from overrunning my aquascape?

Mount it on an isolated “island” rock surrounded by sand. Trim the purple mat weekly at the edge with a razor and siphon fragments. If it creeps where you don’t want it, gently peel the mat; spot-treat any leftovers with a tiny dab of kalk paste. Avoid placing it on main rockwork or touching glass/overflows.

My colony has been closed for days—what should I check beyond basics?

Inspect for algae/cyano film on the mat; blast with a baster and increase flow. Look for vermetid snail threads or detritus lodged at the base—both irritate polyps. Verify stable alkalinity (7.5–9.5 dKH) and recent dips that may delay opening. If newly added, reduce intensity 20–30% and ramp up over 1–2 weeks. Most reopen once irritation is removed.

Is it aggressive, and how does it handle neighbors?

It rarely uses stings; its threat is smothering by overgrowth. It can crawl over zoanthids, mushrooms, and even up glass. Conversely, many LPS and some euphyllids can burn it, leaving bare patches that algae colonize. Provide space, prune routinely, and run fresh carbon if mixing with soft corals to reduce chemical stress.

Metallic Green Center Star Polyps Coral

Overview

Metallic Green Center Star Polyps Coral forms a bright green mat of star-shaped polyps with extended feathery tentacles. Pachyclavularia violacea is a fast-growing encrusting soft coral; it thrives in moderate to high light and moderate, varied water flow. It is primarily photosynthetic via symbiotic algae but can take fine particulate foods, which may support faster growth and richer color. Place it on an isolated rock or away from slow growers, as it can spread quickly and overrun neighboring corals.

Quick Facts

Care Easy

Lighting Low–Moderate

Flow Moderate, indirect

Placement Low–Mid

Temperament Semi-aggressive (rapid encruster; isolate or provide 3–6 inches clearance)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 380–430 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic, phytoplankton, microplankton, rotifers, oyster eggs, copepod nauplii, powdered coral foods, marine snow

Care & Placement

Metallic Green Center Star Polyps Coral (Pachyclavularia violacea) is hardy and fast-growing when kept stable. Provide moderate light (PAR ~80–150); acclimate to brighter light over a week to prevent bleaching. Use moderate to strong, random flow to keep the purple mat free of detritus and film algae, which can cause closed polyps. It’s primarily photosynthetic but benefits from occasional fine particulate foods (reef roids, phytoplankton) 1–2 times weekly; target feed lightly to avoid excess nutrients. Maintain temperature 75–81°F (24–27°C), salinity 1.024–1.026, pH 8.1–8.4, alkalinity 8–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 2–15 ppm, phosphate 0.03–0.10 ppm. Test weekly, use an ATO for steady salinity, and avoid rapid swings—this species is tough but can sulk or recede with instability.Place on an isolated rock “island” on the sandbed or lower to mid level to control spread; it’s peaceful but can overgrow neighbors. Give a few inches of space from slower corals. Secure the frag with gel glue and ensure good flow around the base. Acclimate via dip and slow light adjustment. If polyps stay closed, check for low flow, pests, algae on the mat, or recent parameter changes; gently baste the surface and correct flow. Trim edges with a sharp blade to manage growth, lift the mat if it creeps onto the main rockwork, and avoid shadows that can cause patchy die-off.

FAQ

Frequently Asked Questions

About the Metallic Green Center Star Polyps Coral

Why did my bright metallic green centers fade to dull green or brown?

This coral’s color shifts with spectrum and nutrient balance. Excess white light and high phosphate can deepen zooxanthellae, muting fluorescence. Increase blue/UV channels, keep NO3 ~5–15 ppm and PO4 ~0.03–0.1 ppm, and avoid rapid swings in alkalinity. Strong, randomized flow helps keep the mat clean so tissue reflects light better. Expect gradual recovery over 1–3 weeks.
How do I prevent Pachyclavularia violacea from overrunning my aquascape?

Mount it on an isolated “island” rock surrounded by sand. Trim the purple mat weekly at the edge with a razor and siphon fragments. If it creeps where you don’t want it, gently peel the mat; spot-treat any leftovers with a tiny dab of kalk paste. Avoid placing it on main rockwork or touching glass/overflows.
My colony has been closed for days—what should I check beyond basics?

Inspect for algae/cyano film on the mat; blast with a baster and increase flow. Look for vermetid snail threads or detritus lodged at the base—both irritate polyps. Verify stable alkalinity (7.5–9.5 dKH) and recent dips that may delay opening. If newly added, reduce intensity 20–30% and ramp up over 1–2 weeks. Most reopen once irritation is removed.
Is it aggressive, and how does it handle neighbors?

It rarely uses stings; its threat is smothering by overgrowth. It can crawl over zoanthids, mushrooms, and even up glass. Conversely, many LPS and some euphyllids can burn it, leaving bare patches that algae colonize. Provide space, prune routinely, and run fresh carbon if mixing with soft corals to reduce chemical stress.