Can Blue Tang (Regal Tang) Live With Hillstream Loach?
Incompatible pH. Blue Tang (Regal Tang) needs 8.1–8.4, Hillstream Loach needs 6.5–7.5.
Parameter Comparison
| Parameter | Blue Tang (Regal Tang) | Hillstream Loach | Overlap |
|---|---|---|---|
| Temperature | 75–82°F | 65–75°F | 75–75°F ✓ |
| pH Range | 8.1–8.4 | 6.5–7.5 | No overlap ✗ |
| Temperament | semi-aggressive | peaceful | Monitor ⚠ |
| Max Size | 12" | 3" | Size mismatch ✗ |
| Min Tank Size | 75 gal | 20 gal | 75 gal minimum together |
| Diet | Omnivore | Herbivore | — |
| Care Level | intermediate | intermediate | — |
Species Profiles
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 →Hillstream Loach
Sewellia lineolata
Hillstream loaches are fascinating flat-bodied fish that resemble tiny stingrays. They are specialized for life in fast-flowing, oxygen-rich streams and use their modified pelvic and pectoral fins to grip smooth rocks in strong current. Their unique appearance, algae-eating habits, and cool-water preference make them popular with experienced fishkeepers looking for something different.
Full care guide →