Algae ID

[ExcitableBoy]

Hi all!
Could someone tell me the name of these algae?
Most of my plants have their older leaves covered with these dark green algae.
Maybe GSA? I think I should dose more P and probably N too, because there are also some GBA on the tops of Ludwigia Cuba and Syngonanthus.

 

[three-fingers]

From the colour/pattern it could be GSA, GDA, BGA, a combination of these in a biofilm or other types. Looks like the start of BGA to me, not 100% without seeing/feeling it or at least clearer macro shots. Luckily it doesn't matter unless you are interested in the algae. If you think you need more N and P, you probably do! No harm in adding a little extra if not anyway.

Healthy plant growth is the best way to reduce algae regardless of species 🙂.