Tuxedo urchin reef compatibility check
Mespilia globulus
Tuxedo urchin (Mespilia globulus) is an intermediate-level urchin that needs at least 30 gallons. It is reef safe with caution; can move loose frags and decorations. Temperament varies and adults reach about 3 inches. ReefCrafter schedules it as middle-stage livestock, with no tank-age gate beyond a finished cycle.
Smaller urchin grazer for mature reefs with enough algae film.
Who it is for
Good fit for
- ✓ Tanks of 30+ gallons at the animal's adult size.
- ✓ Newly cycled tanks with a compatible stocking list.
Not a fit for
- ✕ Tanks under 30 gallons, even while it is small.
- ✕ Keepers without some reef experience and stable parameters.
- ✕ Reefs where the cautions on this page would put existing corals or inverts at risk.
- ✕ Can move loose frags and decorations.
Compatibility warnings
- Can move loose frags and decorations.
- Check adult size against the final tank, not the fish or coral at purchase size.
- Add livestock slowly so the bioload and nutrient export can keep up.
- Use the planner when this animal changes the tank-size, flow, lighting, or stocking plan.
Professional planning context
- Use the 30 gallon minimum as an adult-planning floor; display length, aquascape, and existing tankmates can raise that floor.
- This can be planned early after cycling, but only after quarantine/acclimation logistics and stocking order are settled.
- Invert plans should account for copper exposure, acclimation sensitivity, predation risk, and whether the tank can actually feed the animal.
Tank fit and maturity gate
ReefCrafter uses 30 gallons as the planning floor for adult size, swimming room, nutrient load, and aggression margin.
This species can be planned early when the tank is cycled and the rest of the stocking list is compatible.
Care notes
- Temperament
- Varied
- Reef safety
- Caution
- Adult size
- 3 in
- Placement
- Build dependent
- Diet
- Build dependent
- Flow
- Varied
- Light
- None
- Bioload
- 0.3
- Stocking stage
- Middle
Related species
- Pincushion urchin
40+ gallons.
- Atlantic pygmy octopus
Same 30-gallon floor, expert care, reef not safe.
- Bubble tip anemone
Same 30-gallon floor, high light.
- Fighting conch
Same 30-gallon floor, beginner care, reef safe.
Equipment that fits
- Innovative Marine 30L NUVO Fusion PRO AIO Aquarium Bundle
30-gallon display, above this animal's 30-gallon floor.
- Coralife BioCube 32 LED Aquarium
32-gallon display, above this animal's 30-gallon floor.
- Fiji Cube 32 Gallon Rimless AIO Glass Nano Tank PRO Series
32-gallon display, above this animal's 30-gallon floor.
Related reading
Questions
What size tank does the tuxedo urchin need?
ReefCrafter plans for at least 30 gallons, based on an adult size of about 3 inches, plus room to forage and the stability a larger water volume gives. Use the adult size, not the size at purchase.
Is the tuxedo urchin reef safe?
It is reef safe with caution in ReefCrafter's catalog. Watch for: Can move loose frags and decorations.
Is the tuxedo urchin good for beginners?
It is rated intermediate care, so most beginners should add it later, after parameters have been stable.
When should I add the tuxedo urchin to my tank?
ReefCrafter treats it as middle-stage livestock, with no tank-age gate beyond a finished cycle. Add livestock slowly so nutrient export keeps up.