Can Swordtail Live With Blue Tang (Regal Tang)?
Cannot coexist — Swordtail is freshwater, Blue Tang (Regal Tang) is saltwater.
Parameter Comparison
| Parameter | Swordtail | Blue Tang (Regal Tang) | Overlap |
|---|---|---|---|
| Temperature | 72–82°F | 75–82°F | 75–82°F ✓ |
| pH Range | 7–8.4 | 8.1–8.4 | 8.1–8.4 ✓ |
| Temperament | peaceful | semi-aggressive | Monitor ⚠ |
| Max Size | 5.5" | 12" | Similar ✓ |
| Min Tank Size | 20 gal | 75 gal | 75 gal minimum together |
| Diet | Omnivore | Omnivore | — |
| Care Level | beginner | intermediate | — |
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 →Blue Tang (Regal Tang)
Paracanthurus hepatus
The blue tang — Dory from Finding Nemo — is one of the most recognizable marine fish with its vivid royal blue body, black palette marking, and yellow tail. While stunning, they grow large (up to 12 inches), are highly susceptible to ich, and need tanks of 75+ gallons. They are not beginner fish despite their popularity following the movies.
Full care guide →