Green leafy ID please. Friend or foe?

[Zoaelite]

Originally Posted by asylumdown

are those leaf blades connected to each other via a long rhizome like stem? If not, it's probably not caulerpa. It looks almost like baby blades of Ulva lettuce algae, but there's probably a half dozen other species it could be.

Well said, I was going to respond with yup its algae .

Macro algae is a tough subject in reef tanks, generally they are kept in the refugium as they can grow rampant and over take most of your coral. I personally remove anything that's leafy and green, tweezers or a H2O2 dip will work very well.