Is this algae?

[zoon]

I have these rather attractive little bushes of what I think is algae growing on a piece of oak in my tank. It’s very delicate, comes off very easily if you touch it. But my searching isn’t finding a type of algae that looks like this. No other algae in the tank. It’s also growing on the juwel filter box, so makes that look a little more attractive at least! Any idea what it is? It’s spreading very slowly and doesn’t bother me, do I don’t want to know how to get rid of it - I’m just curious

 

[MichaelJ]

Hi @zoon, Yes, and you might find this thread interesting: Help me identify this beautiful green grass/algae?

Cheers,
Michael

 

[Ria95]

Yes, look, position ( attached to a wood piece ) and resistance to the obvious herbivores point to a type of Cladophora. As you say, it grows slower but is very hard to remove.