Why does my Disco Hammer Coral extend tentacles wildly at night, and how much clearance does it need?

Euphyllia ancora deploys long sweeper tentacles after lights out, often reaching 4–6 inches. This is a defensive and feeding behavior. Give it a 6–8 inch buffer from neighbors, especially torches and galaxea. If sweepers are excessive, slightly reduce turbulent flow near the tips and keep moderate nutrients; starving or irritated colonies tend to send longer sweepers.

My wall colony is receding along a ridge—how do I stop a “creeping” tissue loss line?

Wall hammers can lose tissue in bands along the skeleton. Immediately stabilize alkalinity and temperature, increase but soften cross-flow to keep mucus from stagnating, and siphon any decay. A targeted Lugol’s or low-dose hydrogen peroxide dip can help if brown jelly is present. Inspect for vermetids or sharp skeleton edges abrading tissue and cushion the base with epoxy if needed.

Why did my green tips fade under stronger LEDs while growth slowed?

Euphyllia ancora comes from turbid, lagoonal zones and prefers modest PAR (roughly 75–150) with blue-heavy spectrum. Sudden high PAR can bleach tips and suppress feeding. Step down intensity 15–20% and extend blue channels. Keep NO3 around 5–15 ppm and PO4 0.03–0.1 ppm; ultra-lean systems dull pigments. Offer small meaty feeds weekly until color and inflation rebound.

How do I tell flow is right when the flesh contacts the skeleton’s ridges?

You want steady, indirect movement that keeps the mantle gently swaying without folding hard over sharp septa. Signs of too much flow: tissue creasing, drawn-back edges, or exposed skeleton during peaks. Too little: detritus on the rim, stringy mucus, or localized film. Aim cross-flow so tentacles sway in a lazy “S” and no spot gathers debris.

TSA Disco Hammer Coral

Euphyllia LPS Hammers

Overview

Disco Hammer Coral shows hammer- or anchor-shaped tentacle tips on a fleshy, wall-forming colony. Euphyllia ancora is a large-polyp stony coral with a continuous wall skeleton; it prefers moderate light and gentle to moderate, indirect flow. It is photosynthetic with symbiotic algae but benefits from occasional small meaty foods, which can support faster growth and fuller polyp extension. Place with plenty of space, as its sweeper tentacles can sting nearby corals, and avoid high turbulence that can tear tissue.

Quick Facts

Care Moderate

Lighting Moderate

Flow Moderate, indirect

Placement Mid–Low

Temperament Semi-aggressive (6–8 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–450 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped seafood (shrimp, clam), zooplankton/microplankton, coral-specific micro foods (e.g., Reef-Roids), marine snow

Care & Placement

Disco Hammer Coral (Euphyllia ancora) thrives with stable, moderate conditions. Provide moderate light (PAR ~80–150); acclimate by starting in lower light and increasing over 1–2 weeks to avoid bleaching. Use gentle, indirect flow that keeps polyps swaying without blasting; too much flow causes tissue recession, too little invites detritus and film buildup. Feed 1–2 times weekly with small meaty foods (mysis, brine, finely chopped seafood) or fine coral foods; target feed lightly to avoid excess waste. Maintain temperature 24–26°C/75–79°F, salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 5–15 ppm, phosphate 0.02–0.08 ppm. This species is sensitive to rapid alkalinity and temperature swings; test weekly and adjust slowly.Place low to mid in the tank on a stable, smooth surface; this wall-type hammer has a continuous skeleton that can crack if toppled. Keep 6–10 inches from neighbors; it is semi‑aggressive and extends sweepers at night. Avoid direct contact with other corals, including other Euphyllia, to reduce stings and disease spread. Drip acclimate 30–45 minutes and consider a coral dip for pests. Common issues: bleaching (too much light), tissue recession (excess flow or alkalinity swings), and brown jelly disease—promptly siphon, iodine dip, improve flow, and remove affected tissue if possible. Avoid sand blasting if on the substrate, and keep detritus off valleys with gentle flow or occasional baster puffs. Use a PAR meter if available and maintain consistent maintenance and feeding for steady growth and full polyp extension.

FAQ

Frequently Asked Questions

About the TSA Disco Hammer Coral

Why does my Disco Hammer Coral extend tentacles wildly at night, and how much clearance does it need?

Euphyllia ancora deploys long sweeper tentacles after lights out, often reaching 4–6 inches. This is a defensive and feeding behavior. Give it a 6–8 inch buffer from neighbors, especially torches and galaxea. If sweepers are excessive, slightly reduce turbulent flow near the tips and keep moderate nutrients; starving or irritated colonies tend to send longer sweepers.
My wall colony is receding along a ridge—how do I stop a “creeping” tissue loss line?

Wall hammers can lose tissue in bands along the skeleton. Immediately stabilize alkalinity and temperature, increase but soften cross-flow to keep mucus from stagnating, and siphon any decay. A targeted Lugol’s or low-dose hydrogen peroxide dip can help if brown jelly is present. Inspect for vermetids or sharp skeleton edges abrading tissue and cushion the base with epoxy if needed.
Why did my green tips fade under stronger LEDs while growth slowed?

Euphyllia ancora comes from turbid, lagoonal zones and prefers modest PAR (roughly 75–150) with blue-heavy spectrum. Sudden high PAR can bleach tips and suppress feeding. Step down intensity 15–20% and extend blue channels. Keep NO3 around 5–15 ppm and PO4 0.03–0.1 ppm; ultra-lean systems dull pigments. Offer small meaty feeds weekly until color and inflation rebound.
How do I tell flow is right when the flesh contacts the skeleton’s ridges?

You want steady, indirect movement that keeps the mantle gently swaying without folding hard over sharp septa. Signs of too much flow: tissue creasing, drawn-back edges, or exposed skeleton during peaks. Too little: detritus on the rim, stringy mucus, or localized film. Aim cross-flow so tentacles sway in a lazy “S” and no spot gathers debris.