Orange Spine Urchin, Tripneustes gratilla Bio Filter Plate - 8x8x1" • Subsequent lowering of nitrate

• Subsequent lowering of nitrate and phosphate content of water

It should be kept in a 10 gallon or larger aquarium with a sand covered bottom to make burrows in

while the especially precise micro-adjustment screw

They are strikingly beautiful

Orange Spine Urchin, Tripneustes gratilla Bio Filter Plate - 8x8x1" • Subsequent lowering of nitrateThe Pincushion Urchin has an oval to round body covered with hundreds of uniform spines. Its color can range from red to purple to white and blue. It requires ample hiding places and sufficient room in which to forage in the home aquarium. It generally hides in caves during the day, though it may make a burrow in thick substrates. At night, it comes out to graze on algae, moving about by its suctorial podia that are aligned in five doubled rows. The