Algae type?

[salttanklife]

This came in on a frag a couple months ago and I removed it during a water change. It end up coming back in the same spot and I removed it again tonight. It hasn't spread, but it did seem to bother the golden torch it came in on.

 

[oneofmany]

Ulva.

 

[salttanklife]

Thanks, that's exactly what it is... What I looked up said that it wasn't actually bad for the tank. It helps export nutrients

 

[salttanklife]

It also said that it was a fast grower. It took this around 2 months to get the size it is in the picture.