One SPS coral most coveted by many is the Acropora tortuosa, or 'blue tort.' They aren't impossible to find, but are slow growers and usually cost a pretty penny to acquire. The above piece is about 1" tall, and would cost about $45.00. This blue coral with green polyps adds beautiful color to any reef tank, and is worth every cent. :) ORA aqua-cultures this coral, which means it is grown in captivity for the hobby trade and are not harvested from the world's reefs. The above piece has smaller branches growing out along the base, which is a good sign of a healthy frag.