Good or bad

[Irondog702]

New to hobby tank is about 8 weeks old noticed this today anyone know what it is? Thank you in advance for your time

 

[Irondog702]

Under all blue lights

 

[AlgaeBarn]

Looks like its possibly sea lettuce growing on that. Hard to tell from the white pics Shaun K.

 

[Irondog702]

so is that good or bad it feels like rubber and and is actually like little branches more than a leaf