What are these?

[Flo5777]

Found these all over my filter & heater chamber. I’ve hopefully removed them. What are they? Bristleworm eggs?
Many Thanks,
Flo

 

[Townes_Van_Camp]

Sponge of some sort.

 

[Mikedawg]

I would research pineapple sponges; harmless and usually go away on their own

 

[mww00ds]

Pineapple sponges. Harmless helpful filter feeders. They'll grow in the dirtier parts of the tank. As the tank ages they'll disappear

 

[Kasrift]

Agree with @mww00ds , pineapple sponges, harmless and beneficial, and in all honesty every tank has them and they'd be impossible to eliminate.

 

[Daenion]

I had quite a few pineapple sponges they like high nutrient and low light places.

 

[timry2]

If they are soft then sponges and are good, if those pointy things are hard then they are vermetid snails. Get all of them out ASAP. They are a pest and multiply fast