Can Molly Live With Blue Tang (Regal Tang)?
❌Not Compatible
Cannot coexist — Molly is freshwater, Blue Tang (Regal Tang) is saltwater.
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Parameter Comparison
| Parameter | Molly | Blue Tang (Regal Tang) | Overlap |
|---|---|---|---|
| Temperature | 72–82°F | 75–82°F | 75–82°F ✓ |
| pH Range | 7–8.5 | 8.1–8.4 | 8.1–8.4 ✓ |
| Temperament | peaceful | semi-aggressive | Monitor ⚠ |
| Max Size | 4.5" | 12" | Similar ✓ |
| Min Tank Size | 20 gal | 75 gal | 75 gal minimum together |
| Diet | Omnivore | Omnivore | — |
| Care Level | beginner | intermediate | — |
Species Profiles
Molly
Poecilia sphenops
beginnerpeaceful20+ gal
Mollies are versatile livebearers that come in many varieties including black, dalmatian, balloon, and sailfin. They prefer hard, alkaline water and can even tolerate brackish conditions. They are active, personable fish that breed easily.
Full care guide →Blue Tang (Regal Tang)
Paracanthurus hepatus
intermediatesemi-aggressive75+ gal
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 →Other Compatible Tank Mates
For Molly:
For Blue Tang (Regal Tang):
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