underwater spider web?...any suggestions?

[BayouTurtle]

Just looking for an ID for this thing. I noticed it forming a few days ago and now its pretty much closed in except for the hole you can see. Thanks!

 

[homer1475]

Looks like a sponge of some sort to me.

 

[JUNBUG361]

+1 on sponge

 

[BayouTurtle]

Thanks! I'll do some research into them. I'm guessing neither a bad or good thing?

 

[Stolireef]

Good thing. Filter feeder cleans the water. Also suggests good water quality.

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[AlSimmons]

The white thing with the hole in it looks like a sponge of some sort, but those little trees growing from the rock are Foraminiferans I believe. (harmless)