Siphon it out. It will probably come back. You need to address the
cause. Do you have lots of circulation in your tank? Dead spots? Is
your skimmer working optimally? If you are like me you are probably
overfeeding. Cut it back. I reduced mine in half. My fish did not
skip a beat. Your tank is new so it is probably not your bulbs although
this can be a cause. Too much nutrient in the water is the most likely
cause so look for ways to reduce it. Good luck

Todd