Tell me these are not flat worms

[jamal-188]

I've recently purchased several new corals and noticed these today when I was cleaning my skimmer pump. Are these flatworms? If so I guess I"l be looking for some flatworm exit tomorrow. Pen tip is to give reference for size.

[Anemoneman]

No. They're sponges. Harmless, we all got 'em.

[jamal-188]

Sponges? Wow, that's wierd, I've never noticed these before.

[kreach]

Those look like q-tip sponges to me... completely harmless.

[jamal-188]

Thanks guys, don't have any of my books home tonight and was just worrying. I did a search on google for pics and didn't see too many pictures and figured I'd check with the experts to find out for sure.

Did they probably come on one of my corals and recenlty multiply like crazy? They were all over my pump and I've never seen them before.

[kreach]

They are a pretty common hitchhiker... probably came in on a piece of liverock.

Here's a closeup pic...