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oK its a type of algae that feeds of off silicone, nitrate and oxygen. In new tanks the silicone used to seal your tank releases tiny bits of silicone in to the water over time the tank will settle and mature and it will die off. I think it took about a month for it to go away in my tank. It got real bad where my live rock and everything was cover'd in it and then it started dieing off and now my tank looks beautiful. I would wait it out. You should google it and learn about it. Its interesting. Anyhow good luck.
Diatoms would make your water cloudy because they are microscopic and they float. It looks like you have cyano bacteria. It is caused by over feeding, low flow and if your skimmer is not effective.