Red Blue Spotted Radiata Urchin (RBSRU100301)
Astropyga radiata
Reef Compatible: Yes
Care Level: Intermediate
Disposition: Peaceful
Minimum Tank Size: 50 gallons
Mature Size: 8 inches
The Red Blue Spotted Radiata Urchin is a striking species prized by reef aquarists for its vibrant coloration and active grazing behavior. This specimen displays the characteristic spiny appearance and distinctive spotted pattern that makes the species instantly recognizable.
As a peaceful reef inhabitant, it thrives in established tanks with plenty of rockwork and algae to forage. The radiata urchin helps maintain tank balance by consuming excess algae and detritus. Its intermediate care requirements make it suitable for experienced hobbyists who can provide stable water conditions and adequate space.
| Size | L (approx. 4 inches) |
|---|---|
| Species | Astropyga radiata |
| Compatibility | Reef compatible |
FAQ
What is the mature size of the Red Blue Spotted Radiata Urchin?
The mature size of the Red Blue Spotted Radiata Urchin is 8 inches.
Is this urchin suitable for a beginner reef tank?
No, this urchin has intermediate care requirements and is best suited for experienced hobbyists with a stable reef environment.
How much algae does the Radiata Urchin consume?
It actively grazes on excess algae and detritus, helping to maintain a balanced reef ecosystem.

Nicholas Hodges –
The urchin has been in my 50-gallon tank for three months and is very active. It’s been eating algae on the rockwork and has not caused any issues with other inhabitants. The coloration is vibrant and it looks healthy. I appreciate the peace it brings to the tank.
Ryan Young –
It arrived quickly and looks exactly as described. I’ve kept it in a well-established tank with plenty of live rock. It’s been grazing consistently and has not shown signs of stress. A good addition to a reef setup.
Jennifer Lambert –
This urchin is a standout in my tank. The red and blue spots are very noticeable and it moves around actively. I’ve noticed less algae buildup since introducing it. Very satisfied with the purchase.