Black Assessor Basslet

A rare and highly sought-after basslet known for its unique upside-down swimming behavior and beautiful lavender-purple coloration accented by bright yellow highlights. Peaceful, hardy, and full of personality, Randall’s Assessor Basslet is an outstanding addition to reef aquariums and a favorite among collectors looking for something truly different.

🟢 Quarantined (Minimum 2 Weeks) – Fully Conditioned & Eating

Quick Facts

• Care Level: Easy–Moderate
• Temperament: Peaceful
• Reef Compatibility: Reef Safe
• Minimum Tank Size: 30 gallons
• Size: Ranging from approximately 2–3 inches at adult size

Behavior & Husbandry

Randall’s Assessor Basslets are known for their fascinating behavior, often hovering beneath ledges or swimming upside down around caves and overhangs. This unique behavior is completely natural and makes them one of the most interesting fish to observe in a reef aquarium.

They prefer aquariums with plenty of rockwork, caves, and shaded areas where they can feel secure. While initially shy, they typically become more visible as they settle into their environment.

Their peaceful temperament makes them excellent additions to community reef tanks and they are generally non-aggressive toward tankmates.

Feeding & Diet

Carnivorous and typically easy to feed once acclimated.

What We Feed at Lush Corals:

• Frozen mysis shrimp
• Enriched brine shrimp
• Small pellet foods

In Your Aquarium:

• Frozen foods
• Small pellets
• Small meaty foods

A varied diet helps maintain coloration, health, and long-term success.

Compatibility Notes

Compatible with:

• Clownfish
• Gobies
• Blennies
• Wrasses
• Tangs
• Most peaceful reef fish

Excellent choice for community reef aquariums due to their peaceful nature.

Avoid housing with highly aggressive fish that may intimidate them.

Lush Corals Quarantine & Conditioning Process

This fish has completed our full quarantine and conditioning protocol (minimum 2 weeks) prior to being made available.

During this process, each fish is:

• Carefully observed and stabilized
• Proactively treated and monitored
• Conditioned onto prepared foods
• Verified to be actively eating and thriving

This extended process significantly reduces stress and increases long-term success, ensuring you receive a fish that is healthy, stable, and truly ready for your reef.

We don’t rush fish to market—every quarantined fish we offer has been given the time it needs to succeed in your aquarium.