Can anyone Identify these?

[Danireef13699]

Hi wondering if anyone can identify these creatures that are in the sump of my biocube. I have had a few tanks in the past and have never seen these before. Are they harmful and do I need to remove them?

 

[bradleym]

These are pineapple sponges. They are not harmful at all.

 

[Stephen8169301]

These are pineapple sponges. They are not harmful at all.

+1

 

[Danireef13699]

Thank you!