Pls I’d this good or bad

[onobob]

20 yr old reef is growing this all over?

 

[Dburr1014]

Not sure what I'm seeing. You have white light?
I see coral and maybe hair algae? And maybe me sponge. It's all just a guess with this super blue picture.

 

[onobob]

Yellow algae? Or sponge? Has coated the underside of all the live rock seems to be taking over the green star polyps ! Not too worried about the gsp is way overgrown the 200 gal tank.

 

[Dburr1014]

Sponge most likely.

 

[Om84]

Sponge

 

[Graffiti Spot]

Nothing better than sponge growth that’s blown up! Nothing worse than blue light id pictures though :)