Blue Assessor

Assessor macneilli

Blue Devilfish · Macneill's Assessor

Predators & Oddballs

A unique Australian endemic with a deep royal blue body that often swims upside-down beneath ledges and overhangs. Blue assessors are peaceful, hardy, and completely reef-safe — an excellent choice for community reef tanks. They are mouth-brooders that can be bred in captivity and are increasingly available through Australian aquaculture.

Difficulty Beginner

Reef Safety Reef Safe

Temperament Peaceful

Min Tank Size 75L

Diet Carnivore

Available Stock

2 Blue Assessor listings in stock across 2 Australian reef shops, from $40 to $70 (median $55), as of 2026-10-16.

Shops with stock

Ocean Reefs Marine 1 from $70
Reeftopia 1 from $40

In stock only

More Predators & Oddballs

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Products link directly to the shop's listing. AussieReefing is not affiliated with these shops.