Silver Tip Xenia coral has silver lines on the polyps, will color up bright blue under VHO, like the other xenia species, it pulses. It's bigger and taller than the other sp. of Xenia. They grow best in medium to high lighting, and feed on phytoplankton (Marine Plankton) and reef supplements, such as iodine, iodide, iron, strontium and trace elements.