The Polleni Grouper, also known as the Harlequin Grouper, is one of the most visually stunning saltwater groupers in the aquarium hobby. With its deep violet-to-blue body covered in bold golden spots and striking patterns, this fish is a true showpiece for large marine aquariums. While hardy and relatively adaptable, the Polleni Grouper is a predatory species best suited for experienced aquarists who can provide proper tank size, conditions, and compatible tank mates.

Key Features

• Gorgeous deep-blue to violet body with bright golden-yellow spots.

• Hardy and adaptable once acclimated to a stable saltwater environment.

• Grows into a large and commanding centerpiece fish.

• Requires a spacious tank and compatible tank mates.

• Long-lived with proper care, making it a true investment fish.

Appearance

• Juveniles display intense coloring with a higher concentration of spots.

• Adults can reach 18–20 inches in length, requiring a large aquarium.

• The unique golden spots and contrasting body make them highly desirable among collectors.

• Known for their regal, slow-swimming yet powerful presence in the tank.

Water Conditions & Tank Setup

The Polleni Grouper thrives best in a large, well-maintained saltwater aquarium:

• Tank Size: Minimum 200 gallons (larger preferred as they grow).

• Temperature: 74°F – 82°F (23°C – 28°C).

• pH Level: 8.1 – 8.4.

• Salinity: 1.020 – 1.025 specific gravity.

• Filtration: Strong filtration and protein skimmer required; groupers are messy eaters.

• Aquascaping: Provide rock structures and caves for hiding; leave open swimming space.

Behavior & Tank Mates

Polleni Groupers are territorial predators, so choosing tank mates is crucial:

• Best kept with other large, semi-aggressive marine species.

• Compatible with:

  • Large Angelfish

  • Tangs

  • Triggerfish (non-aggressive types)

  • Large Wrasses

• Avoid housing with small fish, shrimps, or crabs – they will be eaten.

• Should not be housed with other groupers to prevent territorial disputes.

Feeding Habits

Being carnivorous predators, Polleni Groupers require a protein-rich diet:

• Feed a varied diet of fresh or frozen meaty foods such as:

  • Shrimp

  • Squid

  • Clams

  • Fish fillets

• They may accept large pellet foods over time.

• Feed 2–3 times per week (adult groupers do not need daily feeding).

• Avoid feeder fish to reduce risk of disease introduction.

Care & Maintenance

• Regular water changes (20% every 2 weeks) are essential for water quality.

• Due to their size and diet, they produce a heavy bioload – strong filtration is a must.

• Hardy once established, but stress from poor acclimation or cramped tanks can lead to disease.

• Lifespan: 10+ years with proper care, making them a long-term commitment.

Why Choose the Polleni Grouper?

The Polleni Grouper is not just a fish – it’s a centerpiece species that commands attention in any large saltwater display. With its dazzling colors, regal movements, and hardy nature, it is a prized addition for advanced marine aquarists.

✨ For those seeking a rare, beautiful, and powerful show fish, the Polleni Grouper is the ultimate choice for a large marine aquarium.