Saltwater Fish
Sixline Soapfish

Species Description…

Scientific Name: Grammistes sexlineatus
Common Name: Sixline Soapfish
Species Group: Wrasses
Habitat: Reef Safe
Care Level: Intermediate
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Community Fish
Max Fish Length: 5 (inches)
Min Aquarium Size: 30 (gallons)
Native Range: Western Atlantic, including the Caribbean Sea, Gulf of Mexico, and the southeastern coast of the United States
Grammistes sexlineatus - Sixline Soapfish

Grammistes sexlineatus (Sixline Soapfish)

Overview

  • Native to the Indo-Pacific, found in coral reefs, lagoons, and rocky coastal environments.
  • Easily identified by its dark body adorned with six horizontal yellow lines running from head to tail.
  • Capable of excreting toxic mucus as a defense mechanism against predators.
  • Solitary in nature, preferring to stay hidden among rock crevices during the day.
  • A slow-moving yet efficient ambush predator that preys on smaller fish and crustaceans.

Feeding

  • Carnivorous diet, mainly consuming small fish, shrimp, and other crustaceans.
  • Prefers live foods but can be conditioned to eat frozen and prepared marine foods.
  • Readily accepts squid, silversides, and chopped seafood in captivity.
  • Best fed multiple times per week to maintain a healthy weight and activity level.
  • Care should be taken to avoid housing with small tank mates that may be mistaken for prey.

Habitat

  • Inhabits coral reefs, overhangs, and rocky reef formations at depths of up to 50 meters.
  • Requires an aquarium with ample rockwork for hiding and territory establishment.
  • Prefers dimly lit areas and will often retreat into caves when startled.
  • Thrives in well-oxygenated environments with stable water parameters.
  • A minimum tank size of 75 gallons is recommended due to its potential size and territorial behavior.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C).
  • Ideal pH range: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Requires high-quality filtration to handle its carnivorous diet and waste production.
  • Not suitable for reef tanks as it may prey on ornamental crustaceans and small fish.
  • Care should be taken when handling due to its toxic skin secretion, which can harm tank mates.

Compatibility

  • Best suited for predator-specific or semi-aggressive community tanks.
  • Compatible with larger fish such as groupers, lionfish, and triggers.
  • Should not be housed with small or delicate species that could become prey.
  • Prefers a tank with minimal aggression but can defend itself if necessary.
  • Does best in a tank where it can establish its own territory without frequent disturbances.

Aquarium Behavior

  • Mostly nocturnal, becoming more active during evening hours.
  • Spends much of its time hiding in rock crevices and coral caves.
  • Exhibits ambush predation, waiting for prey to pass before striking.
  • Can become bold once acclimated but remains slow-moving and deliberate.
  • Thrives in an environment with consistent feeding and stable water quality.