These are everywhere in my overflow and sump

[RJ F.]

Not sure if these are even critters. But these sacs? Are all over my overflow and sump walls. Any ideas? Thanks in advance

 

[Emma01]

Not sure if these are even critters. But these sacs? Are all over my overflow and sump walls. Any ideas? Thanks in advance

They’re Sea pineapples. They’re filter feeders and perfectly harmless. I’ve got loads also

 

[acso151]

Pineapple sponge I believe.

 

[Crabs McJones]

+1 pineapple sponges

 

[RJ F.]

Thanks for the quick responses everyone. I always love finding something new in my tank. I'm glad to hear these are not bad! It's so weird how many organisms find life in our tanks. I was blown away when I found pods in my chaeto