Greetings sicshift & Happy New Year !
Maiden's Hair: Chlorodesmis fastigiata (aka "Turtle Weed").
This alga likes bright light, vigorous curent, and iron supplementation. It is typically very hardy, once established. Be careful in your specimen selection. Many of the specimens that I see did not ship well, i.e., a significant number of individual strands have lost their green pigments and have become translucent/white. Those specimens tend to die off rapidly.
In my systems, the strands have a tendency to break off, reattach, and begin new algal colonies. Some might consider this a nuisance. It can also sporulate, causing MANY new algal colonies. This can definitely be a nuisance (... a very cool nuisance, depending upon where it reattaches).
A word of caution: You might wish to consider holding off on introducing this species until after the "algae succession cycle" that normally occurs in newly established tanks. I would seriously ponder and hesitate before adding algal nutrients to a tank in the middle of the "succession wars." JMO.
HTH,
GDW