Green leafy ID please. Friend or foe?

[SanguinesDream]

Originally Posted by reefwars

so is aiptasia:P

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.

Yup, and they have a root like structure on the bottom of that rock that goes into the sand. It just started growing this past week, so I'm not sure if it has released spores yet. I best get on it before it spreads.

The difficulty is that my flowerpot grows out of this rock and is very finicky about being touched. I don't know how well it would take to a dip, besides I don't think a dip would get all the rhizomes. Maybe an injection of lemon juice or vinegar?