Looking for help

[MarkeReef]

Thinking this is some kind of Algae. Only see them when the flow stops or when doing water change you see them come up from the sand. Will try and get better pictures if need. Any help as to what this is or help on what to do is much appreciated
Thank you
Mark

 

[blaxsun]

Possibly with a bit more white light.

 

[MarkeReef]

Have a video put can’t post it . Couple more pictures will try for better one later

 

[MarkeReef]

Some more

 

[MarkeReef]

Asking around and the last couple days form local shops and seems no one knows .