Blue-Lined Flatworm
The Blue-Lined Flatworm, scientifically known as Pseudoceros concinnus, is a striking and peaceful aquatic invertebrate commonly found in marine environments.
Native to tropical and subtropical waters, this flatworm features a distinctive blue line running along its body, making it a visually appealing addition to a well-maintained aquarium.
Key Features
- Species: Pseudoceros concinnus
- Size: Up to 2 inches in length
- Lifespan: 2 to 3 years
- Water Temperature: 72–78°F (22–26°C)
- Water pH: 8.1–8.4
| Characteristic | Value |
|---|---|
| Species | Pseudoceros concinnus |
| Size | Up to 2 inches |
| Lifespan | 2–3 years |
| Water Temperature | 72–78°F |
| Water pH | 8.1–8.4 |
FAQ
Is the Blue-Lined Flatworm suitable for a community aquarium?
Yes, the Blue-Lined Flatworm is generally peaceful and does not pose a threat to other tank inhabitants when properly maintained.
How often should I feed the Blue-Lined Flatworm?
This species is primarily a scavenger and does not require regular feeding. It feeds on organic matter and detritus naturally present in the tank.
Can the Blue-Lined Flatworm survive in freshwater?
No, this species is marine and requires saltwater conditions to thrive.


Max Abraham –
The Blue-Lined Flatworm arrived quickly and looks exactly as described. It’s a beautiful addition to my saltwater tank and doesn’t seem to disturb other fish. Easy to maintain and very active in the corner of the tank.
Alan Butler –
I’ve had this flatworm for about two months now. It’s vibrant and stays in one area without causing any issues. I appreciate the clear species information provided with the product.
Nicola Wright –
A unique and eye-catching creature. The blue line is very visible and adds a nice visual element to the tank. It’s not aggressive and blends well with the environment.