What is the stuff on the rock

[RibbonFish]

See the pictures. Found them today.

https://www.reef2reef.com/threads/need-id-please.367022/

Looks like a certain algae growing on the rocks. like vein...

The only thing I am worried is , they are occupying coral space, and coral has nowhere to grow. ...

Thanks for any help.

CA: 400
DKH: 7.0
Mg: 1280
Phosphate and Nitrate : undetectable.

 

[Crabs McJones]

See the pictures. Found them today.

Looks like a certain algae growing on the rocks. like vein...

The only thing I am worried is , they are occupying coral space, and coral has nowhere to grow. ...

Thanks for any help.

CA: 400
DKH: 7.0
Mg: 1280
Phosphate and Nitrate : undetectable.

Your picture isn't showing up

 

[RibbonFish]

Your picture isn't showing up

I posted it here as well.

https://www.reef2reef.com/threads/need-id-please.367022/

Thanks