The Variegated Sea Urchin grows to 4 inches in diameter regularly in captivity. It spines stretch it out to nearly 5 inches in diameter. Because of its large size it can/will be a bulldozer around small coral frags. They also like to wear loose objects, (including snails and hermits), as camoflage. THEY ALSO SCRATCH ACRYLIC. Putting empty shells on them to wear reduces this tendency. They will mow down any and all edible macroalgae as they grow. Their definition of edible algae is pretty expansive, and they eat calcified algae as well. We try to ship them around 2-3 inches in diameter to make shipping affordable. At that size they are still pretty formidable against algae. If you have a huge tank and want "monster sized" pincushions we can do that too, the urchin price would be the same, but the shipping cost would go up a bit. 

When these animals reach adult size they are only for the very largest of reefs with very stable structure, touch tanks, or large fish only with live rock tanks. (FOWLRs)

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