Purple Sea Slug
The Purple Sea Slug, scientifically known as Hypselodoris apolegma, is a striking marine invertebrate native to tropical Pacific waters. This species is known for its vibrant purple coloration and unique, elongated body shape.
Key Features
- Species: Hypselodoris apolegma
- Color: Deep purple with subtle iridescent sheen
- Size: Approximately 3 to 5 cm in length
- Lifespan: Up to 2 years in captivity
- Habitat: Requires a saltwater aquarium with stable water parameters
Water Conditions
| Parameter | Range |
|---|---|
| Temperature | 24–27°C |
| Salinity | 32–34 ppt |
| Water pH | 8.1–8.4 |
| Flow | Low to moderate |
Feed regularly with small pieces of algae or specialized sea slug food. Avoid direct sunlight and strong currents.
FAQ
What is the ideal water temperature for keeping a Purple Sea Slug?
The ideal water temperature is between 24°C and 27°C.
Can Purple Sea Slugs survive in a freshwater aquarium?
No, Purple Sea Slugs require saltwater and cannot survive in freshwater environments.
How often should I feed my Purple Sea Slug?
Feed once every 2 to 3 days with small pieces of algae or specialized sea slug food.

Max Johnston –
The Purple Sea Slug arrived healthy and vibrant. It has been living in my 20-gallon tank for two months and remains active and colorful. The water parameters are stable, and I’ve maintained a consistent feeding schedule. It’s a beautiful addition to my marine setup.
Virginia Gray –
I was impressed by the slug’s appearance and behavior. It stays in one area and seems to be adjusting well to the tank conditions. I feed it once every three days with algae wafers. It’s not very active, but it looks healthy and appears content.
Deirdre Reid –
The slug has been a highlight in my aquarium. It moves slowly but deliberately, and its color is vivid. I keep the temperature and salinity within the recommended range. It’s easy to care for and adds a unique touch to the tank.