Purple Firefish Goby: The Elegant & Regal Dartfish
The Purple Firefish Goby (Nemateleotris decora), also known as the Decorated Firefish, is a stunning and graceful species that adds a touch of royalty to any marine aquarium. Its unique appearance features a vibrant purple or lavender body that transitions into a striking white and red tail, with bold black accents on its dorsal and anal fins. This elegant dartfish is known for its serene temperament and its graceful hovering over the rockwork, only darting into a hiding place when startled. The Purple Firefish Goby is a peaceful and non-aggressive species, making it an excellent addition to a community reef tank with other docile fish.
Specifications
| Feature | Detail |
|---|---|
| Scientific Name | Nemateleotris decora |
| Common Name | Purple Firefish Goby |
| Size (adult) | 2.5 to 3.5 inches |
| Temperament | Peaceful, non-aggressive |
| Compatibility | Community reef tanks with docile fish |
| Water Conditions | Salinity: 1.020–1.025, Temperature: 72–78°F, pH: 8.1–8.4 |
FAQ
What is the typical size of a Purple Firefish Goby when fully grown?
A Purple Firefish Goby typically reaches a size of 2.5 to 3.5 inches when fully grown.
Is the Purple Firefish Goby suitable for a community reef tank?
Yes, the Purple Firefish Goby is peaceful and non-aggressive, making it a good choice for a community reef tank with other docile fish.
What are the ideal water parameters for keeping this goby?
Ideal water conditions include salinity of 1.020–1.025, temperature between 72–78°F, and pH in the range of 8.1–8.4.

Sean Greene –
I added the Purple Firefish Goby to my 55-gallon reef tank last month. It has been very calm and spends most of its time hovering near the rockwork. The coloration is vivid and stands out beautifully. It doesn’t stress other fish and has adapted well to the tank conditions. A great addition for anyone looking for a visually striking yet peaceful fish.
Stephanie Burgess –
This goby is a true eye-catcher. The purple body with white and red tail is stunning. It’s active but not aggressive and seems to enjoy the natural lighting. I’ve had it for three months now and it’s still healthy and active. Perfect for a beginner reef keeper who wants a showy, calm fish.
Kimberly Grant –
The fish arrived healthy and looks exactly as described. It’s not very active, which is fine for me. I like how it moves slowly and gracefully. It doesn’t interfere with other tank inhabitants. A bit shy at first, but now it’s comfortable in its space.