What is this?

[Emre_Temur]

Hi from Turkey,
I started to cycle my tank 21 days ago, I used live aragonite. Biodigest and bacteri feeder.there are five molies in it for starting the cycle. Today I changed the rocks and moved some sand. I saw this thing. Don’t know is it alive, buy realized it has some feeding movements? Or am I dreaming?

 

[JaimeAdams]

looks like algae

 

[Emre_Temur]

looks like algae

Thanks for your attention.
Video quality is poor, but one of them has a opposite umbrella like thing, like mount and arms? But the other has not.