What is this ?

[NanoreefingMP]

I know this has probably had been asked a million times, but is this cyano or what ? It’s not slimey but blows away when I push water at it with the turkey baster and when I rub my finger on the rock. Disappears at night and comes back once the lights are on. It’s just weird because it isn’t slimy at all
Any suggestions?

 

[DSC reef]

Looks like cyano to me.

 

[Ranjib]

The one in the sand is likely. The one in the rock, im not sure about. I have something like that for quiet some time, and it does not spread, neither its that slimy.