Overview
The Yellow Assessor (Assessor flavissimus) is a intermediate saltwater species known for its bright yellow coloration. Bright yellow. Surfaces.
Origin & Appearance
Origin: Western Pacific.
Colors: Bright Yellow.
Body Shape: Fusiform (torpedo/streamlined). Typical adult dimensions: 6.0 x 1.1 x 1.8.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 20 gallons |
| Temperature | 75–81°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | low |
| Oxygen Demand | low |
| Plant Safe | yes |
| Aquarium Position | Surfaces |
Behavior & Activity
Inverted cave swimmer; same upside-down ledge behavior as blue assessor; extremely shy; stays hidden
Speed: 30/100Aggression: 2/10diurnal
Breeding
Moderate; paternal mouthbrooder
Common Diseases
💊 Hardy
Expert Notes
Bright yellow; cave dwelling; rarely seen