yet another I.D request

[DJOstrichHead]

I bet these kind of threads get pretty old

I first noticed it when it was around 1/8 of an inch and has since grown to about 3/8 inch. It has a white crown, almost like a feather duster but very short.

I wasnt concerned at first i thought i might just be a tunicate or something of that sort but now that 3 other ones have suddenly popped up around i am concerned i need to stop the spread.

 

[greenbean36191]

It's a small calcareous sponge. They're harmless and their population will wax and wane as the tank matures and nutrient levels settle down.

 

[icy1155]

Pineapple Sponge, other wise +1 ^

 

[rverbeck]

Sponge, reef safe, it will even help with water quality from what I understand (filtering). Nothing to be worried about though. I have them in my tank too.

 

[timthetoolman]

I had them 10 years ago but I don't see anymore. They are fine though. Actually I've seen them in my sump, I guess they like to filter the water as it passes by.

 

[urville]

pineapple sponges. now you know where they got spongebobs house.