Another unknown

[Kens Bees]

These leafy things on the right side of the frag have been getting bigger/longer for a few weeks. They're dark and are pretty stiff, the "fronds" only move a little when the powerhead hits it. I'd say they're about 1/4" long. I haven't seen anything like it online. Any thoughts?

 

[MrX]

Probably some kind of algae that was on the frag plug. Have you tried pulling out the frag and scraping it off?

 

[Chris A.]

Definitely looks like some type of caulerpa

 

[Kens Bees]

Could be that algae. Next water change I’ll pull th plug and see what it really looks like. It is definitely annoying the coral, so it’s going.