Brown hairs????

[jsg3050]

Hello, I’m new to saltwater tanks and I’ve noticed in my tank I have some brown hairs on my dry rock... can someone please tell me what it could be?

 

[Flippers4pups]

Hello, I’m new to saltwater tanks and I’ve noticed in my tank I have some brown hairs on my dry rock... can someone please tell me what it could be?

Could you get a better picture of it?

 

[jsg3050]

Could you get a better picture of it?

The first pic was today, the picture currently attached was about 2 days ago