Dino or diatoms or something else?

[Maxim.dockx]

Tank is 1.5 year old. Moved 4 months ago with new sand.
Now i got this algae on the sand. Rocks are pretty ok.
Could this still be a mini cycle going on on the sand or am i dealing with something worse

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[AlSimmons]

It looks more like Cyanobacteria IMO.

https://www.reefcleaners.org/nuisance-algae-id-guide