Pencil Urchin
Eucidaris tribuloides
Compatibility at a Glance
✗Not reef compatible — avoid with reef
✗Not coral compatible — avoid with coral
✓Invertebrates compatible — can be kept with invertebrates
Pencil Urchin is not considered reef safe — it is likely to eat or damage corals and/or ornamental invertebrates and belongs in a fish-only system.
Compatibility
✗ Reef Compatible✗ Coral Compatible✓ Invertebrate Compatible
Care Parameters
- Type:
- invert
- Aggression:
- peaceful
- Swimming Zone:
- midwater
- Minimum Tank:
- 30 gallons
- Schooling:
- No
- Diet:
- omnivore
- Safety:
- ✗Reef✗Coral✓Invert
Compatibility with Popular Tankmates
Verdicts from our compatibility engine, assuming a typical 90-gallon reef tank. How our engine works →
- ✗Ocellaris Clownfish — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Yellow Tang — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Royal Gramma — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Firefish Goby — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Coral Beauty Angelfish — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Blue Green Chromis — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Pajama Cardinalfish — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →
- ✗Sixline Wrasse — Avoid. Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts Full verdict →