Algae I.D for cycling tank please

[longsl]

Hi bros, I'm cycling my first nano tank with 12 lighting hours/day.
Fisrtly with brown algae as normal but some strange green algae appear after that and almost grown base on brown algae are.

It look like a tree algae with 1 root and many boughs. Please help I.D it and share me information if it's problem

Thanks you

 

[sixty_reefer]

It looks like Green hair algae, have you introduced any cuc members yet?