Overview
The Upside-Down Jellyfish (Cassiopea xamachana) is a advanced saltwater species known for its brown-green (photosynthetic) coloration. Sits upside-down. Bottom.
Origin & Appearance
Origin: Caribbean.
Colors: Brown-Green (photosynthetic).
Body Shape: Jellyfish (bell-shaped). Typical adult dimensions: 30.0 x 30.0 x 15.0.
Sexual Dimorphism: N/A; colonial.
Tank & Water Requirements
| Min Tank Size | 30 gallons |
| Temperature | 75–81°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | low |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Bottom |
Behavior & Activity
Sits upside-down on sandy bottom; bell faces upward for photosynthesis; pulsates gently; barely mobile
Speed: 5/100Aggression: 1/10diurnalSchooling (3+)
Breeding
Complex; polyp/medusa lifecycle
Common Diseases
💊 Temperature sensitivity
Expert Notes
Sits upside-down; photosynthetic zooxanthellae