Halloween Hermit Crab

It seems like you might be referring to a Moon Wrasse (likely Thalassoma lunare), a colorful species of wrasse.

The Moon Wrasse is a vibrant, active species that can bring both beauty and functionality to a saltwater aquarium. Here are some reasons to consider adding one to your tank

The Moon Wrasse is known for its brilliant green and blue hues, along with a characteristic yellow “moon” shaped marking on its back. It is a truly stunning fish that will stand out in your aquarium.

Moon Wrasses are energetic and curious, constantly swimming and exploring their environment. They add life and movement to your tank, making them entertaining to watch.

The Moon Wrasse is generally reef-safe but should be monitored with smaller, delicate invertebrates. They are better suited to fish-only or larger reef tanks where they have space to swim and forage.

Like many wrasses, the Moon Wrasse helps control pest populations, particularly bristleworms and small invertebrates, making it a natural cleanup crew member.

This species is relatively hardy and can adapt well to a variety of tank conditions, making it suitable for intermediate to experienced aquarists.

The Moon Wrasse is carnivorous, feeding on a diet of live and frozen foods such as shrimp, crabs, and small fish. They also scavenge for small invertebrates in the tank.

• Tank Size: A minimum of 75 gallons is recommended to provide enough swimming space for this active species.
• Aggression: Like many wrasses, Moon Wrasses can be territorial, especially with similar-sized or similar-looking species. Careful tankmate selection is important.
• Jumping: Wrasses are known for jumping, so make sure your tank is securely covered.