What's this stuff growing in my sump?

[jmt1030]

Any idea?

 

[tdileo]

Pineapple sponges! Harmless filter feeders. They will grow on your overflow and other areas. They are a sign that your tank is going okay, usually newer tanks have them and the population will go down after the first 2 years. They shouldn't ever reach crazy numbers though

 

[saltyfilmfolks]

The second pic
http://melevsreef.com/critters/spirorbid-worms

 

[BigJohnny]

Pineapple sponges! Harmless filter feeders. They will grow on your overflow and other areas. They are a sign that your tank is going okay, usually newer tanks have them and the population will go down after the first 2 years. They shouldn't ever reach crazy numbers though

+1

 

[jmt1030]

Thank you all!