Worm or algae? OK, don't laugh at me!

This came off the live rock after a few weeks. Lots of them, and we like them! Never mind the hair algae! Very new tank. Thanks for your collective knowledge!

 

Looks like algae to me maybe this will help Untitled
just keep hitting next on the pic till you find what it is.

 

Thanks sferris, that's a great resource. I see similar things, but nothing quite like this.

 

Hi Yote, that's what I thought at first. They are decidedly green, and the 'fronds' don't retract. I'll try to get a better picture later.
Thanks guys!

 

Those are weird.

 

Maybe some kind of clove polyp?

 

That's a tough one. I've never seen anything like it. Based on the fact that it's green, that alone indicates it's an algae... But I'm really not sure.

 

Yes they are!!

I don't think so, the 'polyps' are very light and feathery

Algae, that's the way I was leaning.

Someone put a bug in my head about hydroids... It's possible, but i still haven't found anything quite like this!

 

those are not hydroids. but i do think it is some kind of alage

 

Great news! I think I would not like to have a tank full of hydroids! I sent a note to the guy I got the aqua-cultured live rock from. I imagine he knows what it is...
Thanks daugherty!

 

It looks like someone sprinkled seeds of some type in there. They look like seedlings to me.

 

these are colonial hydroids

 

OK, they are most definitely acetabularia species! Still not sure if good or bad yet. They are getting funky, but cool looking green discs at the head. Someone described them as Dr. Seuss-like and I have to agree! I'll try to get a pic of them to show you all

 

Nice hydroids James!