What is this?

[jts813]

I noticed this white structure in my macroalgae. Not sure if it some plastic or something real or to be concerned about?

 

[Dan_P]

Hard to see. Does it look like a dead alga frond?

 

[Cell]

Looks like a possible sponge to me, but it's hard to see.

 

[Reefkeepers Archive]

Can't tell in the photo, but my best guess is a sponge of some sort, harmless filter feeders

 

[Brazilian Reefer]

Looks like a possible sponge to me, but it's hard to see.

That’s what I was going to say