ID, please help....

[secret_reefer337]

Can somebody ID this please (see pic). This stuff showed up in my tank a week or so ago and I don’t know if I should scrape it or let it grow. I have never since this stuff in my tank before. No new rocks or corals have been added lately.

 

[emilio365]

Kind of looks like deflated bubble algae? I never seen anything like it.

 

[fishguy242]

hi,i believe ulva,sea lettuce

 

[JGT]

Def algae. Pull out and discard.

 

[secret_reefer337]

Thanks! I did removed it and checked, it is hollow and no water inside.