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it's been a while but to me that looks like diatoms. Cyano typically has more of like a silky kinda texture...and is colored differently.
You don't talk about what kind of flow you have in the tank - unless your gut-loading the tank with nutrients, high flow generally discourages the cyano growth.
The diatoms will resolve themselves in a few days. Just monitor the water params until they stabilize then have them ship ya part 2!
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Phil
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