Any idea what these are?

[Shad Quill]

They showed up within the last 48 hours.

 

[3mm3]

In the first picture you have pineapple sponges

Edit: they are in both pictures.

 

[Shad Quill]

In the first picture you have pineapple sponges

They are everywhere in my sump. Are they a beneficial sponge?

 

[3mm3]

They are everywhere in my sump. Are they a beneficial sponge?

I personally feel they are just another piece to the puzzle for a reef aquarium. I have them in my sump also, pretty normal.

Here is some deep reading
http://reefkeeping.com/issues/2005-07/rs/index.php

 

[3mm3]

Here is a quick screen shot from the article in the link where it talks about them briefly.