Live Rock Hitchhiker...What Is It?

[jamespias]

Just like it says...Tank has been up for about 3 months. Never seen this before, but this morning I found three. It looks like a white vase with little white hairs sticking out of the top. Any suggestions? It is towards the center of the image on the bottom side of the rock.

 

[mariobrothersleeve]

Type of feather duster, normal and harmless

 

[bjohanson1234]

If it the little white thing in the center, it is a q-tip sponge or pineapple sponge. They are good little guys that come and go as nutrients are in your tank. Harmless.

 

[grozier]

pineapple sponge