What do you think Orange Spotty Algae is?

Shnolby

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I’ve had the reef breeders LED running on this 2 month old tank for only about a week now. Yesterday I noticed some orange spots appearing on the sand and rocks. Today there are noticeably more of these spots, I saw they’ve began to cover the shell. My nitrate and phosphate levels are still 0 due to an extremely low bio load.
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They only appear in areas of high light. I don’t have any spots on the under side of rocks or in caves, so I think that definitely narrows it down to algae. I’m brand new to saltwater and expect some stages to come and go, not worried about a little ugly growth at first, but was wondering how common this type is?
 
Diatoms and associated with newer systems and tanks that release silicates. Quite common
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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