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

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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.