fish-tank › fish species
Pencil Urchin (Eucidaris tribuloides)
Algae grazer with thick spines (vs spine-prone tuxedo urchin); may rearrange small frags but reef-safe.
Specifications
- ecosystem
- saltwater
- min tank gallons
- 30
- adult size in
- 4
- temperature range f
- 72-78
- ph range
- 8.1-8.4
- salinity sg
- 1.024-1.026
- care difficulty
- intermediate
- aggression
- peaceful
- community compatible
- yes
- schooling min count
- 1
- diet
- herbivore
- lifespan years
- 5-10
- tank zone
- bottom
Sources
- Bulk Reef Supply public guides · ingest 2026-05-06
- ReefBuilders public spec PDFs · ingest 2026-05-06
- Manufacturer spec sheets (Fluval, Eheim, Seachem, Hygger, NICREW, Inkbird, Hagen, Aqueon, Waterbox, Innovative Marine, Red Sea, UNS, Cobalt, Finnex, Hydor, Twinstar, Kessil, AI, CO2Art, GLA, Aquatek, ADA, CaribSea, Reef Octopus, Bubble Magus, Eshopps, Sicce, Ecotech Marine, AquaTop, API, Salifert, Hanna) · ingest 2026-05-06