The Bali Pincushion Urchin is round with very short spines and grows only up to 3 inches in diameter. It may carry shells, algae, bits of rubble on its back in order to shade or camouflage itself. The Bali Pincushion Urchin is a grazer that roams around the tank searching for food and alga on the substrate and rockwork. Hence lots of live rock work is required in an aquarium, so that the live rocks encourage the growth of algae on itself. The Bali Pincushion Urchin is not really considered reef safe, as it may damage or nip over the delicate corals by crawling over it. It can also fed by introducing attached algae sheets to a piece of rock with a clip or rubber band, if there is deficient in algal growth in the aquarium. Apart from this, the Bali Pincushion Urchin can also be provided with dried seaweed for its continued good health. If its spines are poked in your hand while handling, it may cause some mild irritation, and therefore using gloves are recommended to avoid any accidents from the spines. Also, the Bali Pincushion Urchin can act as a good water quality indicator, because it drops its spines if the water quality is not of a good quality level. It is not advisable to keep the Urchins along with puffer and trigger fishes as they can pick the spine off them and can break open their shell to eat them. But the Bali Pincushion Urchin does well within a reef tank and can act as a method to wipe out a large algae problem. It doesn?t have any distinctive characteristic of female and male, thus breeding is quite impossible in captivity.