Sponges?

[curiousphil]

These things started randomly popping up all over my live rock about a month ago. Not sure what they are... look like yellow sponges but the tube mouth things are throwing me off.

 

[Pistol]

This maybe
http://www.captivereefs.com/forum/invert-index/yellow-sponge-19298/#.VFAwxPnSE2A

 

[AdInfinitum]

Look up Tunicates aka sea squirts.

 

[curiousphil]

After some Googling I have seen some people call them pineapple sponges but also found a reference to colonial tunicates. So you may have nailed it AdInfinitum!

 

[TORX]

I agree with AdInfinitum. Pineapple sponges have more of a distinctive crown on the top and are white. The ones you posted kook more like a tube on the top then a crown.

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[curiousphil]

Yes they all have a distinctive tube emerging from the top of them.