ID please

[kavatica]

So I just happens to look in my overflows and saw a bunch of these guys could really use some help on identifying what I have going on and the negative effects, please.
Thanks all

 

[Dsnakes]

Lots of pineapple sponges. Good filter feeders. They will come and go with available nutrients

 

[Tom Blevins]

these?

sponge.

 

[kavatica]

Lots of pineapple sponges. Good filter feeders. They will come and go with available nutrients

Ty sir

 

[kavatica]

these? View attachment 582179 sponge.

Ty

 

[KJ]

Sponge and Spirorbid Worms.