Colony of green balls growing - Identification?

[Drew Nietert]

This is the best pic I could get, these are all about a 1-2 millimeter in diameter and just noticed them tonight.

Can any one identify these?
This is the only spot in the tank I found them and the total size of the "colony" is less than a half inch in length

 

[MartinE]

looks like bubble algae, Valonia

 

[ChrisRD]

I agree, looks like Valonia.

 

[Anonymous]

In my opinion you should attempt to remove them when you see them. They look pretty cool if there's 2 or 3 but generally Valonia will start to reproduce rapidly and you could end up with them everywhere.

 

[ChrisRD]

Agreed.

 

[MartinE]

yep I agree too.

 

[Drew Nietert]

Yeah, two days latter I see more on other rocks
I will remove them all.

Thanks