What is this algae bloom?

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SaltyPirate

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This is my second tank and it’s currently cycling, the cycle has only been running for a week.
This black “algae” appeared when the tank was being filled with RODI water, I had to fill it over the course of three days.
What is this algae?? It’s only in the areas that have high flow. Lights on only to show the algae

7C91E4F8-1F44-4D82-9D93-398475F904D3.jpeg 8A6B1A70-44EE-4FE3-ABA5-B4A136864516.jpeg 7C6D6D28-00BB-4BBA-AD9E-803F658428B4.jpeg
 
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Garf

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Photos are in colour. It’s a light dusting but it’s black and started appearing when it was only RODI in the tank and has stayed since I’ve added salt and started the cycle.
I would try siphoning it out, what ever it is. Black is an odd colour to have, but presumably it’s a contaminant from the sand.
 
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