help ID

[Skunk Shrimp]

tank seems happy and healthy. just trying to figure out what this is.

 

[vetteguy53081]

tank seems happy and healthy. just trying to figure out what this is.

Harmless pineapple sponges. Often silicates are cause. Can be from new rock, new sand, from tap water if used and expired or leaking Di Resin cartridges.
These are short lived and will dissipate as silicates reduce. You can peel them off with the edge of a credit card into a net if they are too many
They are not harmful and cherish algae if they get any

 

[Cell]

Pineapple sponges are a good sign of a healthy, maturing tank.