Need help with an id again

[Dmac]

I've started to notice a few of these white cottony egg sac looking things on a couple of my coral. They almost look like spider egg sacs. Anybody?

 

[Shawn]

pineapple sponges - good filter feeders and a sign your tank is doing well!!!

 

[Dmac]

Really? Have no idea where they came from, lol. I have a tendency to rip out first and ask questions later. Thanks.

 

[urbanknight]

+1. Agree. I have a ton of them growing in my tank.

 

[Doberman13]

Yea in my experience they will blow up and be everywhere that light doesn't fully touch and then slowly die off to a reasonable number. Never bothered anything in my tank.