I believe this is dino

[Flounder's Reef]

Any one have any ideas it's a folwer tank been up since 2018 but this is its third tank I've done many blackouts but it always comes back i do run a 40watt uv the tank is a 240g to not it's also not on the sand. I plan on getting a microscope if I must. Thanks

 

[Mr. Mojo Rising]

It looks like a type of hair algae to me

 

[Gumbies R Us]

Parameters of your tank? Is it just on the rock or on the sand as well