Identification of critters in overflow box

[reef_junkie]

I saw these things a while back thinking they would be no harm, but I decided now to identify them to see if they were good or not to have in my tank. There are hundreds of them in my overflow box. Anyone know? Thanks!


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[coralbandit]

Pineapple sponges.
All good ,filter feeders...

 

[reef_junkie]

Thanks!


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