Unknown species

[badbowtie]

Help, I don't know what these tiny critters are or how they came. I'm worried they may be harmful. A short video is attached and any insights would be most appreciated. They are in a cluster below the two snails.

 

[Redfoxtang]

Unfortunately I cannot see the video any way you can post a picture?

 

[Cell]

The little white dot looking things? Spirorbid worms, harmless.