Harlequin Basslet (Serranus tigrinus)

Harlequin Basslet (Serranus tigrinus)

The Harlequin Basslet native to the Caribbean, this captivating fish spends much of its time weaving through caves and rockwork before darting out to hunt, making it a fascinating addition to larger marine aquariums.

Harlequin Basslets are hardy and adapt well to established saltwater aquariums with plenty of live rock, caves, and hiding places.. Feeding two to three times daily helps maintain their health and vibrant coloration. While they are generally safe with corals, they are not considered fully reef safe. As they mature, they may prey on small ornamental shrimp, tiny crabs, and very small fish that can fit in their mouth. For this reason, they are best kept with medium to large, confident tank mates.

Care & Temperament

Care: The Harlequin Basslet is an easy to moderately cared-for species that does best in a mature, stable aquarium with plenty of live rock, caves, and hiding places. Offer a varied diet of frozen meaty foods along with high-quality marine pellets or flakes to keep it healthy and thriving.

Temperament: Semi-aggressive. Generally peaceful with medium to larger fish but can become territorial around its chosen cave. May prey on very small fish, ornamental shrimp, and other small crustaceans.

Why We Love It

• Stunning maze-like black and cream pattern that stands out in any aquarium.

• Hardy and adaptable once established.

• Active personality with fascinating hunting behavior.

• Makes an excellent centerpiece fish for larger reef or fish-only systems.

• Constantly explores rockwork while adding movement and character to the aquarium.

Suggested Parameters

• Care Level: Easy to Moderate

• Temperament: Semi-Aggressive

• Reef Safe: With Caution (may eat ornamental shrimp and very small fish)

• Minimum Tank Size: 75 Gallons

• Diet: Frozen mysis shrimp, brine shrimp, chopped seafood, quality marine pellets and flakes

• Temperature: 76–80°F (24–27°C)

• Salinity: 1.024–1.026 SG

• pH: 8.1–8.4

What You're Buying

• One healthy Harlequin Basslet (Serranus tigrinus).

• Every fish is individually inspected before shipping to ensure it is healthy, eating, and in excellent condition.

• Due to the unique natural markings of this species, each Harlequin Basslet has its own one-of-a-kind pattern and coloration.

Health & Acclimation Notes

• Carefully drip acclimate for 30–45 minutes before introducing to your aquarium.

• We recommend quarantining all new fish whenever possible.

• Provide plenty of live rock, caves, and hiding places to help reduce stress during acclimation.

• Keep aquarium lights dim or off for the first few hours after introduction.

• It is normal for new arrivals to be shy while they adjust to their new environment.

• Ensure the aquarium is fully cycled and stable before adding this fish.

• Feed a varied, high-quality marine diet to promote long-term health and vibrant coloration.

Compatible Tank Mates:

• Clownfish

• Tangs

• Angelfish

• Foxfaces

• Larger Wrasses

• Rabbitfish

• Triggerfish (non-predatory species in appropriately sized systems)

Avoid Keeping With:

• Small gobies

• Small blennies

• Firefish

• Decorative shrimp

• Tiny crabs

• Other basslets or similarly shaped territorial fish unless housed in a very large aquarium with ample rockwork.