Any clue what this is

[dschut]

Found this kind of animals in the back of my tank. In the filter / sump part of my Aquamedic Cubicus.
Are they harmfull?

 

[Lovemyreef2015]

Pineapple sponge. Harmless filter feeders

 

[Dragon52]

 

[dschut]

Pineapple sponge. Harmless filter feeders

Thanks! And the name does really resemble the outline of the sponge

 

[MERKEY]

I'd pull one out to make sure it's not a flat worm or some sort.

AND WELCOME!!

 

[Lovemyreef2015]

Thanks! And the name does really resemble the outline of the sponge

You're welcome here is a picture of one so you can be reassured.

 

[reef lover]

#WelcometoR2R !

 

[Crabs McJones]

Welcome to R2R! Pineapple sponge it be

 

[justmee]

I'm glad you posted this, I've been wanting to ask for along time, and I too have a crap load of these all over my sump...

 

[Crabs McJones]

I'm glad you posted this, I've been wanting to ask for along time, and I too have a crap load of these all over my sump...

Sumps and overflows seem to be their favorite hangout spots

 

[ruskimax]

Blended w some rum, great in a Sponga Colada ...