Size: 0.5 inch Blue Hydnophora is a coral known for its blue coloration, textured surface, and compact encrusting growth form. Its dense, raised structure gives it a unique look compared with many other SPS corals, making it a standout addition to a reef with enough open space for it to grow. This listing is for a frag of our Blue Hydnophora. Photos may include the parent colony for reference, so the coral you receive may vary slightly in size, shape, coloration, branch structure, and overall appearance. Each frag will be selected from the same coral strain and should be fully healed before shipment or pickup. For best results, place this Hydnophora in moderate to high lighting with moderate, indirect flow. Allow plenty of room between this coral and nearby livestock, as Hydnophora can be highly aggressive and may damage corals within reach. Blue Hydnophora does best in an established reef aquarium with stable salinity, temperature, alkalinity, calcium, magnesium, and nutrient levels. Hydnophora is regarded as a relatively hardy stony coral, but its strong sting makes spacing especially important. (tidalgardens.com) Color may vary depending on lighting spectrum, camera settings, screen settings, shipping stress, acclimation, and aquarium conditions.