Larvae in marine sump

[guyhives]

Hi All

I have just noticed these larvae in my sump and do not know what they are. My clownfish laid eggs and most just disappeared so I assumed they'd been eaten. Could these be them or is it something else that I should be concerned about. The larvae is grey/cream in colour and seems to have one round circular tip of a slightly darker colour. Sorry I could not get a more detailed image but very worried. Any thoughts most appreciated.

 

[KrisReef]

Pineapple sponge?

 

[spidercrab]

Looks like sponges to me also.

 

[jeffchapok]

Yep, pineapples. Harmless filter feeders.

 

[guyhives]

I gather that although they are harmless, and to my surprise, a sign of acceptable parameters/water conditions, they have a habit of blocking up mechanical filtration/equipment/pipework if not checked. Do you advise moving them or getting rid?
Many thanks in advance.

 

[reef lover]

I leave them. They tend to come and go with nutrient availability...

 

[guyhives]

I leave them. They tend to come and go with nutrient availability...

Thanks so much, I'll keep an eye on them!