It's tough to say, with the picture. It's tough taking decent pictures that actually show what the eye catches. My opinion is, if the tank has been running for awhile, make sure your parameters are in check. Especially phosphate, make sure it doesn't get over .04 on a quality test kit. My tanks are at 1.26spg. Ensure carbonate, bicarbonate and mag are balanced where they should be. If all is in check, dose aminos. Also, add more fish. I noticed more brilliance in my coral from adding more poop to the tank.