What is this?

[jbaird]

This is a 20 gallon fish only tank. It has been running for over a year. I have not kept up like I should with water changes. But are trying to do better so nutrients are high. I will post levels if so needed.

There are a lot of these in the tank. The biggest are about 1/4 inch in length and have little hairs out of the end. Are they small fan worms? Anemones?

 

[JoJosReef]

Pineapple sponges. Good stuff.

 

[jbaird]

Thanks, that is good to know. I just read up on them. I obviously need to get nutrients back under control.