Does anyone know what this is?

[KTinner]

I thought maybe coralline algae, but I really am not sure.

 

[Troylee]

Could be.. hard to tell under blue lighting.. try a picture under white lighting

 

[vetteguy53081]

I thought maybe coralline algae, but I really am not sure.

Pic extremely dark to tell and will need to be reposted under white lighting

 

[NoohpyT]

looks like cyano