This Acropora millepora extends fine green hairs from the polyps for feeding. The coloration is interesting to me, because it has a blueish tint to it. It is under 175w 10,000K Metal Halide and VHO Actinic lighting. At night, polyp extension is incredible. The sting from this coral burned a Montipora capricornis, which had been accidentally knocked into it. The milli was unfazed!