ID Help

[Bama8200]

What is this growing off my rock. I know some of it is hair algea but I am talking about the bright green tubes.

 

[TropicalNorth]

I call it Caterpillar Weed, it has a few different names. Neomeris annulata is the scientific name.
Harmless, pops up now and then in my tanks. Sometimes it sticks around but other times it dissappears altogether.

 

[Bama8200]

cool i think it looks kinda cool. Its been there a while.