Can Swordtail Live With Firefish Goby?
Cannot coexist — Swordtail is freshwater, Firefish Goby is saltwater.
Parameter Comparison
| Parameter | Swordtail | Firefish Goby | Overlap |
|---|---|---|---|
| Temperature | 72–82°F | 75–80°F | 75–80°F ✓ |
| pH Range | 7–8.4 | 8.1–8.4 | 8.1–8.4 ✓ |
| Temperament | peaceful | peaceful | Both peaceful ✓ |
| Max Size | 5.5" | 3" | Similar ✓ |
| Min Tank Size | 20 gal | 20 gal | 20 gal minimum together |
| Diet | Omnivore | Carnivore | — |
| Care Level | beginner | beginner | — |
Species Profiles
Swordtail
Xiphophorus hellerii
Swordtails are hardy, colorful livebearers named for the distinctive elongated lower tail fin (the 'sword') found on males. They come in many color varieties including red, pineapple, marigold, and tuxedo. Larger than guppies but just as easy to care for, swordtails are excellent community fish that prefer hard, alkaline water.
Full care guide →Firefish Goby
Nemateleotris magnifica
Firefish gobies are graceful, flame-colored marine fish that hover above the rock work like tiny, living flames. Their elongated dorsal spine and gradient from white to red-orange makes them visually striking. They are peaceful, hardy, and reef-safe, making them ideal for beginner marine aquariums. They require a tight-fitting lid as they are notorious jumpers.
Full care guide →