My Alien Hand stays “waxy” and closed for days—normal or trouble?

Periodic shedding is normal; it secretes a waxy film to slough off algae and debris. Ensure strong, chaotic flow across the colony so the film lifts. If closed >7 days, swap/refresh carbon, increase flow slightly, and check salinity stability and temperature. A short iodine/Lugol’s dip can help if you see biofilm or tissue dulling after a heat spike or handling.

Why does my Sinularia polydactyla look brown under whites but pops green under blues?

Many morphs carry fluorescent proteins that glow under blue/actinic lighting but appear tan under full spectrum. If it’s dulling overall, consider that ultra-low nutrients can pale it, while excess dissolved organics can brown it. Aim for moderate nutrients, stable alkalinity, and strong, variable flow. Gradually acclimate to brighter light to avoid bleaching and preserve fluorescence.

It keeps stinging or shading neighbors—how do I manage its reach and chemistry?

This coral can overtop and chemically suppress nearby corals, especially SPS downcurrent. Give generous spacing and place it upcurrent of sensitive species. Run fresh activated carbon and perform regular water changes to reduce allelopathic compounds. Prune advancing lobes before they touch others; removing a few tips monthly controls growth without shocking the colony.

Best practice to frag an “Alien Hand” so frags don’t float away or rot?

Use a clean, sharp blade to cut a healthy lobe tip, avoiding the main stalk. Rinse briefly, then secure the frag to rubble with a toothpick and rubber band or wrap loosely with bridal veil in a low-flow basket until it attaches (1–2 weeks). Increase aeration/carbon after cutting to absorb toxins, and expect temporary deflation.

Alien Hand leather Coral

Leather

Overview

Alien Hand Leather Coral shows thick, finger-like lobes that branch from a rubbery base. Sinularia polydactyla is a soft leather coral; it prefers moderate to strong water flow and moderate lighting. It is primarily photosynthetic via symbiotic algae, but benefits from occasional fine particulate foods, which can support growth and coloration. Place it with space around it and away from sensitive neighbors, as it can release chemicals and grow large.

Quick Facts

Care Easy

Lighting Moderate–High

Flow Moderate-High

Placement Mid–High

Temperament Semi-aggressive (4–6 inches spacing recommended)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–430 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic (primary), phytoplankton, microplankton, marine snow, rotifers, powdered coral foods, dissolved organics

Care & Placement

Alien Hand Leather Coral (Sinularia polydactyla) thrives under moderate to strong, turbulent flow and moderate to high light. Start mid-level and light-acclimate over 1–2 weeks (use a screen or reduced intensity), then move higher if polyp extension remains strong. Good flow helps prevent detritus buildup and supports normal shedding of the waxy film; brief “closed” periods during sheds are normal. Target stable water: temperature 24–26°C (75–79°F), pH 8.1–8.4, salinity 1.025–1.026, calcium 380–450 ppm, alkalinity 8.0–9.5 dKH, magnesium 1280–1400 ppm, nitrate 2–10 ppm, phosphate 0.03–0.08 ppm. Use reliable test kits, a refractometer, and regular carbon plus skimming to manage chemical output and any soft-coral toxins.Photosynthetic feeding meets most needs, but occasional small-particle foods (phytoplankton, rotifers) and amino acids can support growth. Place with 4–6 inches of space from neighbors; avoid contact with stony corals that can sting, and watch for overgrowth or shading. Temperament is peaceful physically but chemically assertive; run fresh carbon and do routine water changes. Acclimate via a slow drip and inspect the base for dead tissue; trim away decay and consider an iodine dip if recession appears. Signs of trouble: bleaching after sudden light increase (lower light 20–30% and move down), limp tissue or poor extension from low flow (increase random flow), persistent slime coat (boost flow and inspect for irritation). Fragging is straightforward on firm branches; secure with toothpicks or rubber bands until attached. Consistent stability is key.

FAQ

Frequently Asked Questions

About the Alien Hand leather Coral

My Alien Hand stays “waxy” and closed for days—normal or trouble?

Periodic shedding is normal; it secretes a waxy film to slough off algae and debris. Ensure strong, chaotic flow across the colony so the film lifts. If closed >7 days, swap/refresh carbon, increase flow slightly, and check salinity stability and temperature. A short iodine/Lugol’s dip can help if you see biofilm or tissue dulling after a heat spike or handling.
Why does my Sinularia polydactyla look brown under whites but pops green under blues?

Many morphs carry fluorescent proteins that glow under blue/actinic lighting but appear tan under full spectrum. If it’s dulling overall, consider that ultra-low nutrients can pale it, while excess dissolved organics can brown it. Aim for moderate nutrients, stable alkalinity, and strong, variable flow. Gradually acclimate to brighter light to avoid bleaching and preserve fluorescence.
It keeps stinging or shading neighbors—how do I manage its reach and chemistry?

This coral can overtop and chemically suppress nearby corals, especially SPS downcurrent. Give generous spacing and place it upcurrent of sensitive species. Run fresh activated carbon and perform regular water changes to reduce allelopathic compounds. Prune advancing lobes before they touch others; removing a few tips monthly controls growth without shocking the colony.
Best practice to frag an “Alien Hand” so frags don’t float away or rot?

Use a clean, sharp blade to cut a healthy lobe tip, avoiding the main stalk. Rinse briefly, then secure the frag to rubble with a toothpick and rubber band or wrap loosely with bridal veil in a low-flow basket until it attaches (1–2 weeks). Increase aeration/carbon after cutting to absorb toxins, and expect temporary deflation.

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Alien Hand leather Coral

Overview

Quick Facts

Recommended Parameters

Care & Placement

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