Pincushion urchin reef compatibility check
Lytechinus variegatus
Pincushion urchin (Lytechinus variegatus) is an intermediate-level urchin that needs at least 40 gallons. It is reef safe with caution; can bulldoze frags and carry objects. Temperament varies and adults reach about 4 inches. ReefCrafter schedules it as middle-stage livestock, with no tank-age gate beyond a finished cycle.
Excellent grazer for mature tanks where frags and rockwork are secured.
Who it is for
Good fit for
- ✓ Tanks of 40+ gallons at the animal's adult size.
- ✓ Newly cycled tanks with a compatible stocking list.
Not a fit for
- ✕ Tanks under 40 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 bulldoze frags and carry objects.
Compatibility warnings
- Can bulldoze frags and carry objects.
- 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 40 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 40 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
- 4 in
- Placement
- Build dependent
- Diet
- Build dependent
- Flow
- Varied
- Light
- None
- Bioload
- 0.4
- Stocking stage
- Middle
Related species
- Tuxedo urchin
30+ gallons.
- Maxima clam
50+ gallons, expert care, high light, reef safe.
- Serpent starfish
50+ gallons.
- Atlantic pygmy octopus
30+ gallons, expert care, reef not safe.
Equipment that fits
- Waterbox AIO 50.3 Aquarium System (49 gallons)
49-gallon display, above this animal's 40-gallon floor.
- Innovative Marine 50 NUVO Fusion Lagoon PRO 2 AIO with Black APS Stand
50-gallon display, above this animal's 40-gallon floor.
- Red Sea MAX NANO G2 XXL Reef System (53 Gal)
53-gallon display, above this animal's 40-gallon floor.
Related reading
Questions
What size tank does the pincushion urchin need?
ReefCrafter plans for at least 40 gallons, based on an adult size of about 4 inches, plus room to forage and the stability a larger water volume gives. Use the adult size, not the size at purchase.
Is the pincushion urchin reef safe?
It is reef safe with caution in ReefCrafter's catalog. Watch for: Can bulldoze frags and carry objects.
Is the pincushion 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 pincushion 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.