Feather duster?

[katguevara]

I have these growing on my rock. Are they feather dusters?

 

[reef lover]

Unless u see a feathery head come out of them I would Lean toward a macro algae of some sorts.

 

[KJ]

Neomeris algea.

 

[Eric23]

That stuff starts to reproduce and pop up everywhere... I had it take over an entire tank but it's comes and goes

 

[Rick cowen]

I've had a few,but never plagues of them