Brown Bubble/Blob?

[ReeferGuyBrett]

I bought this rock from the LFS and it had a little brown bubble/blob on it. Its been a little over a month and its grown and spread slightly. Good or bad?

 

[Gareth elliott]

Botryocladia skottsbergii

 

[ReeferGuyBrett]

Botryocladia skottsbergii

After googling it I don’t believe it’s Botryocladia Skottsbergii. The bubbl/blob in my tank are more brown instead of red and they are one single bubble instead of a colony.

 

[reef lover]

If its not bubble algae i vote sponge either way easily removable by hand.