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Well what I would do is get a few snails and like 1 or 2 turbo snails. They go to town on the algae. Although if the algae is really long u can take the rock out and scrub it with a sponge or old toothbrush because some nails will not eat it if it gets to long. And yes it is def diatoms. It's really nothing to worry about. They will go away I'n like a week.
Diatoms come and go for a while with new tanks.. You will be fine till friday.. Usually once the tank has been up and running for around a year you dont get them anymore..