I would test the water daily for ammonia, nitrites and nitrates. First you'll see a spike in ammonia, then it will go down to 0 and your nitrites will go up. The nitrites will go down when you start getting nitrates. The cycle will be complete when you have zero ammonia and nitrites. The nitrates may be high by then, and you'll bring them down by doing a water change. The whole process may take weeks, but it's worth it to wait until it's completed. While it's cycling, I'd read a book on marine aquariums. Martin Moe has a handbook that's excellent for beginners. And ask a lot of questions here. Good luck!
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12g Nanoreef. Zooanthids, Ricordia, Star Polyps, Acans and two clownfish. CF Lighting, 75% actinic blue, 25% 10,000k white.