Multiplying like crazy! What are they anybody?

[Leoglide]

Could anyone identify these please. They are multiplying rapidly in high flow areas of the tank. Tank about a year old. Biggest about 7mm. Growing mainly on wave makers. I plucked a few off and it seems to have made things worse. They're now growing on tank inlet/outlet and now on the glass as shown in the picture. Its a mystery where they have come from; nothing except food has been introduced to the aquarium. Thanks in advance. New to this forum.

 

[tehmadreefer]

Pineapple sponges, they’ll grow and then die off

 

[Hydrored]

Sponges, harmless

 

[Leoglide]

Wow, quick response. Thank you so much. Nothing I'm doing wrong then? Not an indication of tank issues?

 

[Miami Reef]

Pineapple sponges, they’ll grow and then die off

Wow! They look like pineapples!!

 

[Chefwheredyougo]

Thats where SpongeBob lives.

 

[Gtinnel]

Wow, quick response. Thank you so much. Nothing I'm doing wrong then? Not an indication of tank issues?

Nope nothing you did wrong or anything wrong with your tank. A common, and harmless, inhabitant of a newer tank. They will go away with time.

 

[Leoglide]

Thanks. Loving this new hobby, and all the new developments and things to learn as the tank matures.